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Q:
The hourly wages of a sample of eight individuals is given below.IndividualHourly Wage ($)A27B25C20D10E12F14G17H19For the above sample, determine the following measures:a. The mean.b. The standard deviation.c. The 25thpercentile.
Q:
When the data are positively skewed, the mean will usually bea. less than the medianb. greater than the medianc. less than the moded. greater than the mode
Q:
For data skewed to the left, the skewness is
a. between 0 and .5
b. less than 1
c. positive
d. negative
Q:
If the data distribution is symmetric, the skewness is
a. 0
b. .5
c. 1
d. None of the other answers is correct.
Q:
An important numerical measure of the shape of a distribution is the
a. correlation coefficient
b. variance
c. skewness
d. relative location
Q:
Refer to Exhibit 3-4. The standard deviation is
a. 6.969
b. 7.071
c. 48.570
d. 50.000
Q:
Exhibit 3-4The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.Speed (MPH)Frequency50 - 54255 - 59460 - 64565 - 691070 - 74975 - 79535Refer to Exhibit 3-4. The mean isa. 35b. 670c. 10d. 67
Q:
When should measures of location and dispersion be computed from grouped data rather than from individual data values?a. as much as possible since computations are easierb. only when individual data values are unavailablec. whenever computer packages for descriptive statistics are unavailabled. only when the data are from a population
Q:
In computing descriptive statistics from grouped data,
a. data values are treated as if they occur at the midpoint of a class
b. the grouped data result is more accurate than the ungrouped result
c. the grouped data computations are used only when a population is being analyzed
d. All of these answers are correct.
Q:
A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as
a. an important mean
b. a trimmed mean
c. a weighted mean
d. a heavy mean
Q:
Excel's __________ function can be used to compute the sample correlation coefficient.
a. MAX
b. COVAR
c. VAR
d. CORREL
Q:
The correlation coefficient
a. is the same as the covariance
b. can be larger than 1
c. cannot be larger than 1
d. cannot be negative
Q:
The correlation coefficient ranges between
a. 0 and 1
b. -1 and +1
c. minus infinity and plus infinity
d. 1 and 100
Q:
A numerical measure of linear association between two variables is the
a. variance
b. z-score
c. correlation coefficient
d. None of the other answers are correct.
Q:
Excel's __________ function can be used to compute the population covariance.
a. MAX
b. COVAR
c. VAR
d. CORREL
Q:
Positive values of covariance indicate
a. a positive variance of the xvalues
b. a positive variance of the yvalues
c. the standard deviation is positive
d. a positive relation between the xand the y variables
Q:
A numerical measure of linear association between two variables is the
a. variance
b. covariance
c. standard deviation
d. coefficient of variation
Q:
A graphical summary of data that is based on a five-number summary is a
a. histogram
b. stem-and-leaf display
c. scatter diagram
d. box plot
Q:
In a five-number summary, which of the following is notused for data summarization?
a. the smallest value
b. the largest value
c. the median
d. the mean
Q:
Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $28,000 is
a. 28
b. 1.8
c. -1.8
d. 0.78
Q:
Exhibit 3-3Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500.Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $37,500 isa. 37.5b. 2c. -2d. 0.92
Q:
__________ can be used to determine the percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution.a. Chebyshev's theoremb. empirical rulec. five-number summaryd. box plot
Q:
__________ can be used to make statements about the proportion of data values that must be within a specified number of standard deviations of the mean.
a. Chebyshev's theorem
b. empirical rule
c. five-number summary
d. box plot
Q:
A(n) __________ is an unusually small or unusually large data value.
a. sample statistic
b. median
c. z-score
d. outlier
Q:
The __________ denotes the number of standard deviations xiis from the mean .
a. range
b. median
c. z-score
d. third quartile
Q:
Refer to Exhibit 3-2. The interquartile range is
a. 1
b. 2
c. 10
d. 12
Q:
Refer to Exhibit 3-2. The range is
a. 1
b. 2
c. 10
d. 12
Q:
Refer to Exhibit 3-2. The coefficient of variation is
a. 72.66%
b. 81.24%
c. 264%
d. 330%
Q:
Refer to Exhibit 3-2. The standard deviation is
a. 8.944
b. 4.062
c. 13.2
d. 16.5
Q:
Exhibit 3-2A researcher has collected the following sample data. The mean of the sample is 5.351232Refer to Exhibit 3-2. The variance isa. 80b. 4.062c. 13.2d. 16.5
Q:
The symbol s is used to represent thea. variance of the populationb. standard deviation of the samplec. standard deviation of the populationd. None of the other answers are correct.
Q:
Which of the following symbols represents the standard deviation of the population?
Q:
The symbol ï³2 is used to represent the
a. variance of the population
b. standard deviation of the sample
c. standard deviation of the population
d. None of the other answers are correct.
Q:
Which of the following symbols represents the variance of the population?a. s 2b. sc. md.
Q:
Which of the following symbols represents the mean of the sample?a. s 2b. sc. md.
Q:
Which of the following symbols represents the mean of the population?a. s 2b. sc. md.
Q:
Which of the following symbols represents the size of the sample?a. s 2b. sc. Nd. n
Q:
Develop a stretched stem-and-leaf display for the data set below, using a leaf unit of 10. 136
281
226
123
178
445
231
389
196
175 211
162
212
241
182
290
434
167
246
338 194
242
368
258
323
196
183
209
198
212 277
348
173
409
264
237
490
222
472
248 231
154
166
214
311
141
159
362
189
260
Q:
Missy Walters owns a mail-order business specializing in clothing, linens, and furniture for children. She is considering offering her customers a discount on shipping charges for furniture based on the dollar-amount of the furniture order. Before Missy decides the discount policy, she needs a better understanding of the dollar-amount distribution of the furniture orders she receives.Missy had an assistant randomly select 50 recent orders that included furniture. The assistant recorded the value, to the nearest dollar, of the furniture portion ofeach order. The data collected is listed below.136281226123178445231389196175211162212241182290434167246338194242368258323196183209198212277348173409264237490222472248231154166214311141159362189260a. Prepare a frequency distribution, relative frequency distribution, and percent frequency distribution for the data set using a class width of $50.b. Construct a histogram showing the percent frequency distribution of the furniture-order values in the sample.c. Develop a cumulative frequency distribution and a cumulative percent frequency distribution for this data.
Q:
It is time for Roger Hall, manager of new car sales at the Maxwell Ford dealership, to submit his order for new Mustang coupes. These cars will be parked in the lot, available for immediate sale to buyers who are not special-ordering a car. One of the decisions Roger must make is how many Mustangs of each color he should order. The new color options are very similar to the past year's options.Roger believes that the colors chosen by customers who special-order their cars best reflect most customers' true color preferences. For that reason, he has taken a random sample of 40 special orders for Mustang coupes placed in the past year. The color preferences found in the sample are listed below.BlueBlackGreenWhiteBlackRedRedWhiteBlackRedWhiteBlueBlueGreenRedBlackRedWhiteBlueWhiteRedRedBlackBlackGreenBlackRedBlackBlueBlackWhiteGreenBlueRedBlackWhiteBlackRedBlackBluea. Prepare a frequency distribution, relative frequency distribution, and percent frequency distribution for the data set.b. Construct a bar graph showing the frequency distribution of the car colors.c. Construct a pie chart showing the percent frequency distribution of the car colors.
Q:
What type of relationship is depicted in the following scatter diagram?
Q:
What type of relationship is depicted in the following scatter diagram?
Q:
What type of relationship is depicted in the following scatter diagram?
Q:
What type of graph is depicted below?
Q:
For the following observations, plot a scatter diagram and indicate what kind of relationship (if any) exists between the amount of sugar in one serving of cereal (grams) and the amount of fiber in one serving of cereal (grams). Sugar
Fiber 1.2
3.2 1.3
3.1 1.5
2.8 1.8
2.4 2.2
1.1 2.8
1.3 3.0
1.0
Q:
For the following observations, plot a scatter diagram and indicate what kind of relationship (if any) exists between women's height (inches) and annual starting salary ($1000).HeightSalary644563406839653867426645654364356633
Q:
For the following observations, plot a scatter diagram and indicate what kind of relationship (if any) exist between xand y. x
y 2
7 6
19 3
9 5
17 4
11
Q:
Partial results of a study follow in a crosstabulation of column percentages.Method of PaymentGenderCashCredit CardCheckFemale18%50%90%Male82%50%10%Total100%100%100%a. Interpret the 18% found in the first row and first column of the crosstabulation.b. If 50 of those in the study paid by check, how many of the males paid by check?
Q:
A market research firm has conducted a study to determine consumer preference for a new package design for a particular product. The consumers, ages were also noted. Package Design AgeABCTotalUnder 251818296525 " 401812535Total363034100a. Which package design was most preferred overall?b. What percent of those participating in the study preferred package A?c. What percent of those under 25 years of age preferred package A?d. What percent of those aged 25 - 40 preferred package A?e. Is the preference for package A the same for both age groups?
Q:
The SAT math scores of a sample of business school students and their genders are shown below.SAT Math ScoresGenderLess than 400400 up to 600600 and moreTotalFemale2416848240Male409624160Total6426472400a. How many students scored less than 400?b. How many students were female?c. Of the male students, how many scored 600 or more?d. Compute row percentages and comment on any relationship that may exist between SAT math scores and gender of the individuals.e. Compute column percentages.
Q:
You are given the following data on times (in minutes) to complete a race. Construct a stem-and-leaf display. Specify the leaf unit for the display.15.215.812.411.915.214.714.811.812.012.1
Q:
You are given the following data on the price/earnings (P/E) ratios for twelve companies. Construct a stem-and-leaf display. Specify the leaf unit for the display.23253947223783648283726
Q:
You are given the following data on the annual salaries for eight employees. Construct a stem-and-leaf display. Specify the leaf unit for the display.$26,500$27,850$25,000$27,460$26,890$25,400$26,150$30,000
Q:
You are given the following data on the earnings per share for ten companies. Construct a stem-and-leaf display. Specify the leaf unit for the display.2.61.41.30.52.21.11.10.70.92.0
Q:
Construct a stem-and-leaf display for the following data. Specify the leaf unit for the display.1252513747403826573149434519363244482218
Q:
You are given the following data on the ages of employees at a company. Construct a stem-and-leaf display. Specify the leaf unit for the display.2632284558524436422741535548324244403637
Q:
The grades of 10 students on their first management test are shown below.94619666926875858478a. Construct a frequency distribution. Let the first class be 60 - 69.b. Construct a cumulative frequency distribution.c. Construct a relative frequency distribution.
Q:
The frequency distribution below was constructed from data collected on the quarts of soft drinks consumed per week by 20 students.Quarts of Soft DrinkFrequency0 - 344 - 758 - 11612 - 15316 - 192a. Construct a relative frequency distribution.b. Construct a cumulative frequency distribution.c. Construct a cumulative relative frequency distribution.
Q:
The frequency distribution below was constructed from data collected from a group of 25 students.Height in InchesFrequency58 - 63364 - 69570 - 75276 - 81682 - 87488 - 93394 - 992a. Construct a relative frequency distribution.b. Construct a cumulative frequency distribution.c. Construct a cumulative relative frequency distribution.
Q:
A summary of the results of a job satisfaction survey follows. What is wrong with the relative frequency distribution?RatingRelative FrequencyPoor.15Fair.45Good.25Excellent.30
Q:
The following is a summary of the number of hours spent per day watching television for a sample of 100 people. What is wrong with the frequency distribution?Hours/DayFrequency0 - 1101 - 3453 - 5205 - 7207 - 95
Q:
Fill in the missing value for the following percent frequency distribution.Annual SalariesPercent FrequencyUnder $30,00010$30,000 - 49,99935$50,000 - 69,99940$70,000 - 89,999 $90,000 and over5
Q:
Fill in the missing value for the following relative frequency distribution. Opinion
Relative Frequency Strongly Agree
0.315 Agree
0.460 Disagree Strongly Disagree
0.075 No Opinion
0.070
Q:
Two hundred members of a fitness center were surveyed. One survey item stated, "The facilities are always clean." The members' responses to the item are summarized below. Fill in the missing value for the frequency distribution. Opinion
Frequency Strongly Agree
63 Agree
92 Disagree Strongly Disagree
15 No Opinion
14
Q:
Below you are given the examination scores of 20 students.5299928684637276958892586579809075745699a. Construct a frequency distribution for this data. Let the first class be 50 " 59 and draw a histogram.b. Construct a cumulative frequency distribution.c. Construct a relative frequency distribution.d. Construct a cumulative relative frequency distribution.
Q:
There are 800 students in the School of Business Administration. There are four majors in the School: Accounting, Finance, Management, and Marketing. The following shows the number of students in each major. Major
Number of Students Accounting
240 Finance
160 Management
320 Marketing
80 Develop a percent frequency distribution and construct a bar chart and a pie chart.
Q:
Forty shoppers were asked if they preferred the weight of a can of soup to be 6 ounces, 8 ounces, or 10 ounces. Below are their responses.6661088810661010886668668881088610866888101081086a. Construct a frequency distribution and graphically represent the frequency distribution.b. Construct a relative frequency distribution and graphically represent the relative frequency distribution.
Q:
A sample of 50 TV viewers were asked, "Should TV sponsors pull their sponsorship from programs that draw numerous viewer complaints?" Below are the results of the survey. (Y = Yes; N = No; W = Without Opinion)NWNNYNNNYNNYNNNNNYNNYNYWNYWWNYWWNWYWNWYWNYNYNWYYNYa. Construct a frequency distribution and a bar graph.b. Construct a relative frequency distribution and a pie chart.
Q:
A student has completed 20 courses in the School of Arts and Sciences. Her grades in the 20 courses are shown below.ABABCCCBBBBABBBCBCBAa. Develop a frequency distribution and a bar graph for her grades.b. Develop a relative frequency distribution for her grades and construct a pie chart.
Q:
Twenty employees of ABC Corporation were asked if they liked or disliked the new district manager. Below are their responses. Let L represent liked and D represent disliked.LLDLDDDLLDDLDDLDDDDLa. Construct a frequency distribution and a bar graph.b. Construct a relative frequency distribution and a pie chart.
Q:
Thirty students in the School of Business were asked what their majors were. The following represents their responses (M = Management; A = Accounting; E = Economics; O = Others).AMMAMMEMOAEEMAOEMAMAMAOAMEEMAMa. Construct a frequency distribution and a bar graph.b. Construct a relative frequency distribution and a pie chart.
Q:
Before drawing any conclusions about the relationship between two variables shown in a crosstabulation, you shoulda. investigate whether any hidden variables could affect the conclusionsb. construct a scatter diagram and find the trendlinec. develop a relative frequency distributiond. construct an ogive for each of the variables
Q:
When the conclusions based upon the aggregated crosstabulation can be completely reversed if we look at the unaggregated data, the occurrence is known as
a. reverse correlation
b. inferential statistics
c. Simpson's paradox
d. disaggregation
Q:
Excel's __________ can be used to construct a scatter diagram.
a. Chart Tools
b. SUM function
c. CROSSTAB function
d. COUNTIF function
Q:
A graphical presentation of the relationship between two quantitative variables is
a. a pie chart
b. a histogram
c. a crosstabulation
d. a scatter diagram
Q:
Refer to Exhibit 2-4. Among the students who plan to go to graduate school, what percentage indicated "Other" majors?
a. 15.75
b. 45
c. 54
d. 35
Q:
Refer to Exhibit 2-4. Of those students who are majoring in business, what percentage plans to go to graduate school?
a. 27.78
b. 8.75
c. 70
d. 72.22
Q:
Refer to Exhibit 2-4. What percentage of the students' undergraduate major is engineering?
a. 292
b. 520
c. 65
d. 36.5
Q:
Exhibit 2-4A survey of 400 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school.Undergraduate MajorGraduate SchoolBusinessEngineeringOthersTotalYes354263140No9110465260Total126146128400Refer to Exhibit 2-4. What percentage of the students does not plan to go to graduate school?a. 280b. 520c. 65d. 32
Q:
In a crosstabulationa. both variables must be categoricalb. both variables must be quantitativec. one variable must be categorical and the other must be quantitatived. either or both variables can be categorical or quantitative