Q&A Hero

Q: The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. She took a random sample of the price of 10 computers, with the following results. $3,250, $1,127, $2,995, $3,250, $3,445, $3,449, $1,482, $6,120, $3,009, $4,000 What is the first quartile? A. $1,446.50 B. $2,995.00 C. $3,415.75 D. $3,587.00 E. $4,212.00

Q: The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. She took a random sample of the price of 10 computers, with the following results. $3,250, $1,127, $2,995, $3,250, $3,445, $3,449, $1,482, $6,120, $3,009, $4,000 What is the third quartile? A. $1,446.50 B. $2,617.00 C. $3,415.75 D. $3,449.00 E. $4,212.00

Q: The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. She took a random sample of the price of 10 computers, with the following results. $3,250, $1,127, $2,995, $3,250, $3,445, $3,449, $1,482, $6,120, $3,009, $4,000 What is the 90th percentile? A. $1,446.50 B. $3,449.00 C. $3,415.75 D. $4,000.00 E. $5,060.00

Q: In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What are the lower and upper limits? A. 67, 77 B. 57, 87 C. 37, 107 D. 52, 92 E. 47, 97

Q: In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the IQR? A. 12.00 B. 5.25 C. 10 D. 5.00 E. 11.00

Q: In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the 65th percentile? A. 65.5 B. 67.3 C. 66.75 D. 74.0 E. 77.0

Q: In a statistics class, 10 scores were randomly selected, with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the 10th percentile? A. 65.5 B. 67.3 C. 66.75 D. 73.85 E. 77.0

Q: In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the first quartile? A. 65.9 B. 67.3 C. 67.0 D. 73.85 E. 77.0

Q: In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the third quartile? A. 65.9 B. 67.3 C. 66.75 D. 73.85 E. 77.0

Q: In a statistics class, 10 scores were randomly selected, with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the 90th percentile? A. 77 B. 73 C. 74 D. 67 E. 65.9

Q: Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the standard deviation? A. 342.43 B. 3424.3 C. 58.5 D. 191 E. 10,609

Q: Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6).378, 361, 350, 375, 200, 391, 375, 368, 321What is the variance?A. 342.43B. 3424.3C. 58.5D. 191E. 10,609

Q: Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the range? A. 342.43 B. 3424.3 C. 58.5 D. 191 E. 10,609

Q: The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes;mean = 114.15): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118. What is the standard deviation? A. 103 B. 23.62 C. 557.97 D. 128.8 E. 115

Q: The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes;mean = 114.15): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118. What is the variance? A. 103 B. 23.62 C. 557.97 D. 128.8 E. 115

Q: The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes;mean = 114.15): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118. What is the range? A. 103 B. 23.62 C. 557.97 D. 128.8 E. 115

Q: In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are (mean = 70): 68, 67, 70, 71, 68, 75, 68, 62, 80, 73, 68. What is the standard deviation? A. 18 B. 4.73 C. 22.40 D. 324 E. 6.76

Q: In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are (mean = 70): 68, 67, 70, 71, 68, 75, 68, 62, 80, 73, 68. What is the variance? A. 18 B. 4.73 C. 22.40 D. 324 E. 6.76

Q: In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are (mean = 70): 68, 67, 70, 71, 68, 75, 68, 62, 80, 73, 68. What is the range? A. 18 B. 4.73 C. 22.40 D. 324 E. 6.76

Q: In a statistics class, 10 scores were randomly selected with the following results (mean = 71.5): 74, 73, 77, 77, 71, 68, 65, 77, 67, 66.What is the standard deviation?A. 22.72B. 12.00C. 4.77D. 516.20E. 144.00

Q: In a statistics class, 10 scores were randomly selected with the following results (mean = 71.5): 74, 73, 77, 77, 71, 68, 65, 77, 67, 66.What is the variance?A. 22.72B. 12.00C. 4.77D. 516.20E. 144.00

Q: In a statistics class, 10 scores were randomly selected with the following results (mean = 71.5): 74, 73, 77, 77, 71, 68, 65, 77, 67, 66.What is the range?A. 22.72B. 12.00C. 4.77D. 516.20E. 144.00

Q: According to Chebyshev'sTheorem, a range of how many standard deviations would include at least 80 percentof the values? A. 5.0 B. 2.2 C. 2.5 D. 1.6 E. 2.0

Q: Using Chebyshev's Theorem, approximate the minimum proportion of the data that will be within k for k = 3.2.A. 90%B. 95%C. 84%D. 97%E. 10%

Q: According to Chebyshev's Theorem, at least what proportion of the data will be within k for k = 1.6?A. 39%B. 58%C. 68%D. 61%E. 92%

Q: According to Chebyshev's Theorem, at least what proportion of the data will be within k for k = 2?A. 68%B. 50%C. 25%D. 75%E. 34%

Q: According to a survey of the top 10 employers in a major city in the Midwest, a worker spends an average of 413 minutes a day on the job. Suppose the standard deviation is 26.8 minutes and the time spent is approximately a normal distribution. What are the times within which approximately 99.73 percent of all workers will fall? A. [305.8, 520.2] B. [386.2, 439.8] C. [372.8, 453.2] D. [359.4, 466.6] E. [332.6, 493.4]

Q: According to a survey of the top 10 employers in a major city in the Midwest, a worker spends an average of 413 minutes a day on the job. Suppose the standard deviation is 26.8 minutes, and the time spent is approximately a normal distribution. What are the times within which approximately 68.26 percent of all workers will fall? A. [394.8, 431.2] B. [386.2, 439.8] C. [372.8, 453.2] D. [359.4, 466.6] E. [332.6, 493.4]

Q: Using Chebyshev'sTheorem, find the interval that contains at least 93.75 percentof all measurements when the mean = 2.549 and s = 1.828.A. [-2.935, 8.033]B. [-1.107, 6.205]C. [-26.699, 31.797]D. [2.435, 2.663]E. [-4.763, 9.861]

Q: Find the z-score for an IQ test score of 125 when the mean is 100 and the standard deviation is 15.A. 25B. 1.1C. 1.67D. -1.1E. -1.67

Q: Find the z-score for an IQ test score of 118 when the mean is 100 and the standard deviation is 15.A. 1.2B. 1.0C. 18.0D. -1.03E.-1.2

Q: Find the z-score for an IQ test score of 92 when the mean is 100 and the standard deviation is 15.A. 0.53B. 0.77C. -0.77D. -0.53E. -8.00

Q: Find the z-score for an IQ test score of 142 when the mean is 100 and the standard deviation is 15.A. 42B. 2.8C. 18.78D. 1.27E. -2.8

Q: Find the coefficient of variation for IQ tests with a mean of 100 and a standard deviation of 15. A. 15.0 B. 6.7 C. 0.15 D. 1.5 E. 67

Q: Quality control is an important issue at ACME Company, which manufactures light bulbs. Totest the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321. What is the mode? A. 375 B. 368 C. 389.9 D. 200 E. 346.6

Q: Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321. What is the median? A. 375 B. 368 C. 389.9 D. 200 E. 346.6

Q: Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321. What is the mean? A. 375 B. 368 C. 389.9 D. 200 E. 346.6

Q: The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118. What is the mode? A. 114.15 B. 118 C. 148 D. 45 E. 115.5

Q: The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118. What is the median? A. 114.15 B. 118 C. 148 D. 45 E. 115.5

Q: The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118. What is the mean? A. 114.15 B. 118 C. 148 D. 45 E. 115.5

Q: In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are: 68, 67, 70, 71, 68, 75, 68, 62, 80, 73, 68. What is the mode? A. 70 B. 75 C. 68 D. 71 E. 80

Q: In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are: 68, 67, 70, 71, 68, 75, 68, 62, 80, 73, 68. What is the median? A. 70 B. 75 C. 68 D. 71 E. 80

Q: In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are: 68, 67, 70, 71, 68, 75, 68, 62, 80, 73, 68. What is the mean? A. 70 B. 75 C. 68 D. 71 E. 80

Q: In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the mode? A. 71.5 B. 72.0 C. 77.0 D. 71.0 E. 73.0

Q: In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the median? A. 71.5 B. 72.0 C. 77.0 D. 71.0 E. 73.0

Q: In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the mean? A. 71.5 B. 72.0 C. 77.0 D. 71.0 E. 73.0

Q: The constant return used to forecast future wealth based on actual time periods and their returns is the ____________. A. grouped mean B. geometric mean C. weighted mean D. arithmetic mean

Q: The arithmetic mean is ___________ larger than a weighted mean in a set of data that uses unequal weights. A. always B. sometimes C. never

Q: In the calculation of a mean for grouped data, ___________ are used. A. total sample size and sum of the midpoints of each class B. total sample size and sum of the weighted midpoints C. sum of the frequency of each class and the sum of the midpoints of each class D. sum of the frequency of each class and the sample midpoint

Q: In the least squares line, ___________ is defined as rise/run. A. correlation coefficient B. predicted value of y C. y-intercept D. slope

Q: If b0 = 32 and b1 = −4 and the predicted value of y is 14, what is the value of x? A. −24.0 B. 18.0 C. 4.5 D. 0.56

Q: Which of the following is a measure of the strength of the linear relationship between x and y that is dependent on the units in which x and y are measured. A. covariance B. correlation coefficient C. slope D. least squares line

Q: As the coefficient of variation _______________, risk ______________. A. increases, decreases B. decreases, increases C. increases, increases D. remains constant, increases

Q: An interval that contains a specified percentage of the individual measurements is called a(n) _______________ interval. A. three-sigma B. tolerance C. normal D. empirical

Q: The ______________ is a quantity that measures the variation of a population or sample relative to its mean. A. mean B. standard deviation C. range D. coefficient of variation E. Z-score

Q: The point estimate of the _______________ is the positive square root of the sample variance. A. sample mean B. sample standard deviation C. range D. median E. population standard deviation

Q: If the mean is greater than the median, then the distribution is ___________. A. skewed right B. skewed left C. symmetrical D. bimodal

Q: The average of the squared deviations of the individual population measurement from the population mean is the ___________. A. standard deviation B. mean C. variance D. median E. range

Q: The measurement in a sample or a population that occurs most frequently is the ___________. A. mode B. mean C. median D. outlier E. average

Q: The following data consist of the number of sick days taken by the 100 employees at a small manufacturing company for the past 18 months. Construct a dot plot of these data and describe the distribution. 5, 1, 4, 8, 0, 6, 3, 5, 3, 4, 7, 15, 5, 8, 2, 1, 5, 4

Q: The following table lists the types of customer complaint calls on satellite TV service during the first two months after installation. Construct a Pareto chart.

Q: The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below. 24, 56, 43, 35, 37, 27, 29, 44, 34, 28, 33, 28, 46, 31, 38, 41, 48, 38, 27, 29, 37, 33, 31, 40, 50 Construct a frequency polygon.

Q: The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below. 24, 56, 43, 35, 37, 27, 29, 44, 34, 28, 33, 28, 46, 31, 38, 41, 48, 38, 27, 29, 37, 33, 31, 40, 50 Construct a stem-and-leaf plot.

Q: The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below. 24, 56, 43, 35, 37, 27, 29, 44, 34, 28, 33, 28, 46, 31, 38, 41, 48, 38, 27, 29, 37, 33, 31, 40, 50 Construct a histogram.

Q: Math test anxiety can be found throughout the general population. A study of 116 seniors at a local high school was conducted. The following table was produced from the data. Complete the missing parts.

Q: A local electronics retailer recently conducted a study on purchasers of large screen televisions. The study recorded the type of television and the credit account balance of the customer at the time of purchase. They obtained the following results. Construct a table of column percentages.

Q: A local electronics retailer recently conducted a study on purchasers of large screen televisions. The study recorded the type of television and the credit account balance of the customer at the time of purchase. They obtained the following results. Construct a table of row percentages.

Q: Recently an advertising company called 200 people and asked them to identify the company that was in an ad running nationwide. They obtained the following results. Construct a table of column percentages.

Q: Recently an advertising company called 200 people and asked them to identify the company that was in an ad running nationwide. They obtained the following results. Construct a table of row percentages.

Q: Fill in the missing components of the following frequency distribution constructed for a sample size of 50.

Q: The following is a relative frequency distribution of grades in an introductory statistics course. If we wish to depict these data using a pie chart, find how many degrees (out of 360 degrees) should be assigned to each grade.

Q: The following is a relative frequency distribution of grades in an introductory statistics course. Construct a percent frequency bar chart for this data.

Q: The following is a relative frequency distribution of grades in an introductory statistics course. If this was the distribution of 200 students, give the frequency distribution for this data.

Q: Consider the following data on distances traveled by people to visit the local amusement park. Construct an ogive plot that corresponds to the frequency table.

Q: Consider the following data. Create a stem-and-leaf display for the sample.

Q: The number of items rejected daily by a manufacturer because of defects for the last 30 days are: 20, 21, 8, 17, 22, 19, 18, 19, 14, 17, 11, 6, 21, 25, 4, 19, 9, 12, 16, 16, 10, 28, 24, 6, 21, 20, 25, 5, 17, 8 Construct an ogive plot.

Q: The number of items rejected daily by a manufacturer because of defects for the last 30 days are: 20, 21, 8, 17, 22, 19, 18, 19, 14, 17, 11, 6, 21, 25, 4, 19, 9, 12, 16, 16, 10, 28, 24, 6, 21, 20, 25, 5, 17, 8 Construct a stem-and-leaf plot.

Q: The number of items rejected daily by a manufacturer because of defects for the last 30 days are: 20, 21, 8, 17, 22, 19, 18, 19, 14, 17, 11, 6, 21, 25, 4, 19, 9, 12, 16, 16, 10, 28, 24, 6, 21, 20, 25, 5, 17, 8 Complete this frequency table for these data.

Q: The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below. 24, 56, 43, 35, 37, 27, 29, 44, 34, 28, 33, 28, 46, 31, 38, 41, 48, 38, 27, 29, 37, 33, 31, 40, 50 Construct an ogive plot.

Q: The number of items rejected daily by a manufacturer because of defects for the last 30 days are: 20, 21, 8, 17, 22, 19, 18, 19, 14, 17, 11, 6, 21, 25, 4, 19, 9, 12, 16, 16, 10, 28, 24, 6, 21, 20, 25, 5, 17, 8 How many classes should be used in constructing a histogram? A. 6 B. 5 C. 7 D. 4 E. 8