Q&A Hero

Q: Which of the following is a measure of dispersion? A.mean B.proportion C.range D.all of these choices

Q: Find the mode of the following scores: 1, 2, 3, 4, 5, 5, 7 A.3.86 B.4 C.5 D.6

Q: The measure of central tendency that identifies the value that occurs most often is called the _____. A.mean B.median C.mode D.range

Q: Find the median of the following scores: 1, 2, 3, 4, 5, 5, 7 A.3.86 B.4 C.6 D.27

Q: The value below which half the values in a distribution fall is the _____. A.mean B.median C.mode D.range

Q: Find the mean score of the following set of scores: 2, 5, 7, 4, 8 . A.4.8 B.5.2 C.7 D.26

Q: The formula below is used to calculate the _______ . A.mode of a sample B.median of a sample C.sample mean D.range of a sample

Q: The arithmetic average of a set of numbers is referred to as the _____. A.proportion B.mode C.mean D.median

Q: All of the following are measures of central tendency EXCEPT _____. A.mode B.standard deviation C.median D.mean

Q: Which of the following is a measure of the central tendency of a set of scores? A.mode B.median C.mean D.all of these choices

Q: If 206 people in a sample of 560 people say that they "liked a product" that they purchased during a test market study in Cincinnati, the proportion of people in this study who said that they liked this product was about _____. A.0.40 B.0.37 C.0.56 D.2.71

Q: The percentage of elements that meet some criterion is called a(n) _____. A.top-box score B.distribution C.proportion D.range

Q: _____ is the long-run relative frequency with which an event will occur. A.Probability B.Central tendency C.Estimation D.Deviation

Q: Hank has developed a set of data organized by summarizing the values resulting from rolling a pair of die. He constructed a table of his data and found that five was the most common result. This is an example of a _____. A.population parameter B.mean C.frequency distribution D.median

Q: A set of data organized by summarizing the number of times a particular value of a variable occurs is referred to as a(n) _____. A.inference table B.frequency distribution C.probability sample D.sample summary

Q: Measures computed from sample data are called _____. A.sample statistics B.population parameters C.sample frequencies D.normalized scores

Q: When a researcher wants to estimate national market share based on the results of the test market for a new product in St. Louis and Kansas City, this is an example of _____. A.descriptive statistics B.the central limit theorem C.inferential statistics D.the standardized normal distribution

Q: In most cases, the size of the population does not have a major effect on the sample size.

Q: The variance, or heterogeneity, of the population refers to the standard deviation of the population.

Q: Three factors are required to specify sample size: (1) the variance of the population; (2) the population mean; and (3) the confidence level.

Q: The confidence interval increases as the sample size, n, increases.

Q: A researcher must calculate the population mean to calculate the confidence intervals.

Q: A common practice in research is to use the 75 percent confidence interval about the mean in research studies.

Q: A confidence range is a specified range of numbers within which a population mean is expected to lie.

Q: A point estimate is an estimate of the population mean in the form of a single value.

Q: "As sample size increases, the distribution of sample means of samples of size n (when randomly selected) approaches a normal distribution" is a fundamental assumption of the central-limit theorem.

Q: A frequency distribution of a sample is called a probability distribution.

Q: The standardized value of Z is computed by the formula: Z = (X - m)/s.

Q: The standardized normal distribution is a purely theoretical probability distribution and is of little use in inferential statistics.

Q: The standardized normal distribution has a mean of 1.0 and a standard deviation of zero.

Q: One hundred percent of the scores in a normal distribution fall within plus or minus two standard deviations of the mean.

Q: The normal distribution is represented by the normal curve.

Q: The standard deviation eliminates the drawback of having the measure of dispersion in squared units rather than the original measurement units.

Q: The average deviation score is frequently used in business research studies.

Q: If between 125 and 150 units of a product have been produced each day during the past month, the range of this production is 150 units.

Q: The mode is the measure of central tendency that identifies the value that occurs most often.

Q: The midpoint of a distribution, above which and below which half of the scores fall, is called the mode.

Q: The mean is simply the arithmetic average.

Q: Percentage frequency is the long-run relative frequency with which an event will occur.

Q: A frequency distribution is a set of data organized by summarizing the number of times a particular value of a variable occurs.

Q: Population parameters are measured characteristics of a specific population.

Q: The primary purpose of inferential statistics is to make a judgment about a population.

Q: A list of elements from which the sample may be drawn is called a _____. A.parameter list B.probability sample C.population parameter D.sampling frame

Q: All of the following are stages in the selection of a sample EXCEPT _____. A.analyze data B.select a sampling frame C.determine sample size D.conduct fieldwork

Q: When a researcher has made the decision to conduct a survey using a sample of the population, the FIRST step in the selection of the sample is to _____. A.define the target population B.determine the sample size C.select the actual sampling units D.select a sampling frame

Q: All of the following are reasons for using a sample EXCEPT _____. A.complete enumeration B.pragmatic reasons C.accurate and reliable results D.destruction of test units

Q: A(n) _____ is a subset, or some part, of a larger population. A.slice B.census C.element D.sample

Q: Which of the following refers to any complete group whose members share some common set of characteristics? A.sample B.population C.stratum D.cluster

Q: When a company decides to send an Internet survey to all of its 127-member sales force to determine their morale, this is an example of a _____ A.cluster sample B.multistage area sample C.census D.sample

Q: An investigation of all the individual elements that make up a population is called a(n)_____. A.enumeration B.census C.sample D.stratum

Q: Website Internet surveys use unrestricted samples.

Q: The degree of accuracy required in sampling may vary form project to project.

Q: Multistage area sampling is a cluster sampling approach involving multiple steps.

Q: An area sample is the most popular type of stratified sample.

Q: Stratified samples can be proportional or disproportional.

Q: In stratified sampling a subsample is drawn using judgment sampling within each stratum.

Q: Systematic sampling is a type of true random selection procedure.

Q: A sampling procedure ensuring that each element in the population will have an equal chance of being included in the sample is called simple random sampling.

Q: Randomness characterizes a procedure whose outcome cannot be predicted because it depends on chance.

Q: Snowball sampling involves using probability methods for an initial selection of respondents and then obtaining additional respondents through information provided by the initial respondents.

Q: Judgment sampling ensures that various subgroups of a population will be represented on pertinent characteristics.

Q: A convenience sample is a type of probability sampling method.

Q: Systematic errors are due to chance fluctuations.

Q: As sample size decreases, random sampling error decreases.

Q: A primary sampling unit (PSU) is a unit selected in the first stage of sampling.

Q: The availability of sampling frames is fairly consistent around the world.

Q: A reverse directory provides, in a different format, the same information contained in a telephone directory.

Q: List brokers rent lists of names, addresses, phone numbers, and e-mail addresses of specific populations.

Q: The sampling frame is also called the working population.

Q: A list of all of the members of the San Diego chapter of Notre Dame alumni is an example of a sampling frame.

Q: The first stage in the selection of a sample is to determine the sampling frame.

Q: A bigger sample is needed if the elements of the population are quite diverse compared to if the elements of the population are quite similar.

Q: A sample is a subset, or some part, of a larger population.

Q: A poll is an investigation of all the individual elements that make up the population.

Q: A census is any complete group whose members share some common set of characteristics.

Q: Discuss the criteria researchers consider when deciding on the most appropriate sample design for a specific project.

Q: Name and describe the types of probability sampling.

Q: Name and describe the types of nonprobability sampling.

Q: Compare and contrast random sampling error and systematic (nonsampling) error. How does the researcher minimize these errors?

Q: A smartphone manufacturer is conducting research regarding how smartphones are used in business. Apply the stages the researcher should go through in the selection of a sample for this research study.