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BMAL 590 Quantitative Research Techniques and Statistics
1. A company has developed a new computer sound card whose average lifetime is
unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The five years represents a: Statistics
2. A summary measure that is computed from a population is called a: Para- meter
3. Which of the following is a measure of the reliability of a statistical infer- ence?: A
significance level
4. The process of using sample statistics to draw conclusions about popula- tion
parameters is called: Doing inferential statistics
5.Which of the following represents a population, as opposed to a sample?: All
registered voters in the State of Michigan
6.A study in under way to determine the average height of all 32,000 adult pine trees in
a certain national forest. The heights of 500 randomly selected adult pine trees are measured and analyzed. The sample in this study is: The 500 adult pine trees selected at random selected at random from this forest
7. The significance level of a statistical inference measures: The proportion of times
a conclusion about a population will be wrong in the long run
8. The confidence level of a statistical inference measures: The proportion of times
an estimation procedure will be correct in the long run
9.A marketing research firm selects a random sample of adults and asks them a list of
questions regarding their beverage preferences. What type of data collection is involved here?: A survey
10.Which of the following statements is true regarding the design of a good survey?:
All of these choices are true
11.Which method of data collection is involved when a researcher counts and records
the number of students wearing backpacks on campus on a given day?: Direct observation
12. The difference between a sample mean and the population mean is called-
: Sampling error
13.The manager of the customer service division of a major consumer elec- tronics
company is interested in determining whether the customers who have purchased a videocassette recorder over the past 12 months are satisfied with their products. If there are four different brands of videocassette recorders made by the company, the best sampling strategy would be to use a: Stratified random sample
14.When every possible sample with the same number of observations is equally
likely to be chosen, the result is called a: Simple random sample
15.Which of the following types of samples is almost always biased?: Self-se- lected
samples
16.Which of the following is an example of a nonsampling error?: All of these choices
are true
17.Which of the following situations lends itself to cluster samples?: All of these
choices are true
18.Which of the following causes sampling error?: Taking a random sample from
a population instead of studying the entire population
19.Which of the following describes selection bias?: Some members of the target
population are excluded from possible selection for the sample
20.An approach of assigning probabilities which assumes that all outcomes of the
experiment are equally likely is referred to as the: Classical approach
21.The collection of all possible outcomes of an experiment is called: A sample
space
22.If event A and event B cannot occur at the same time, then A and B are said to be:
Mutually exclusive
23.Which of the following best describes the concept of marginal probabili- ty?: It is a
equal to 5
37.The standard deviation of p is also called th: eStandard error of the sample
proportion
38. If two populations are normally distributed, the sampling distribution of the
difference in the sample means, x 1 - x :2Eixsactly normal for any sample sizes
39.If two random samples of sizes n1 and n2 are selected independently from two
populations with means ¼ 1 and ¼ 2 t,hen the mean of x 1 - x 2 equ: ¼al 1 s - ¼
40.If two random samples of sizes n1 and n2 are selected independently from two non-
normally distributed populations, then the sampling distribution of the sample mean difference, x 1 - x: Is 2 approximately normal only if n1 and n are both larger than or equal to 30
41.The standard deviation of x 1 - x 2 is also called: tShteandard deviation of
the difference between the population means
42.The hypothesis of most interest to the researcher is: The alternative hypoth- esis
43.A Type I error occurs when we: Reject a true null hypothesis
44.A Type II error is defined as: Not rejecting a false null hypothesis
45. Which of the following probabilities is equal to the significance level
±?: Probability of making a Type I error
46.If we reject the null hypothesis, we conclude that: There is enough statistical
evidence to infer that the alternative hypothesis is true
47.Statisticians can translate p-values into several descriptive terms. Sup- pose you
typically reject H0 at level 0.05. Which of the following statements is correct?: All of these choices are true
48.The p-value of a test is the: Smallest ±at which the null hypothesis can be
rejected
49.The numerical quantity computed from the data that is used in deciding whether
to reject H0 is the: Test statistic
50.For a given level of significance, if the sample size increases, the proba- bility of a
Type II error will: Decrease
51.The power of a test is measured by its capability of: Rejecting a null hypoth- esis
that is false
65.In one-way analysis of variance, between-treatments variation is measured by the:
SST
66.When is the Tukey multiple comparison method used?: To test for differ- ences
in pairwise means
67.In Fisher's least significant difference (LSD) multiple comparison method, the LSD
value will be the same for all pairs of means if: All sample sizes are the same
68.Fisher's least significant difference (LSD) multiple comparison method is flawed
because: It will increase ±t;he probability of committing a Type I error
69.When the objective is to compare more than two populations, the experi- mental
design that is the counterpart of the matched pairs experiment is called a: Randomized block design
70.The primary interest of designing a randomized block experiment is to: - Reduce
the within-treatments variation to more easily detect differences among the treatment means
71.A complete 3 x 2 factorial experiment is called balanced if: The number of
replicates is the same for each of the 6 treatments
72.In a two-factor ANOVA, there are 4 levels for factor A, 5 levels for factor B, and 3
observations for each combination of factor A and factor B levels. The number of treatments in this experiment equals: 20
73.A tabular presentation that shows the outcome for each decision alterna- tive
under the various states of nature is called a: Payoff table
74.Which of the following would be considered a state of nature for a business firm?:
Worker safety laws
75.A payoff table lists the monetary values for each possible combination of the:
Event (state of nature) and act (alternative)
76.Which of the following is true?: All of these choices are true
77.Which of the following statements is false regarding the expected mone- tary
value (EMV)?: In general, the expected monetary values represent possible payoffs
78.Which of the following statements is correct?: All of these choices are true
79.The expected value of perfect information is the same as the: Expected
opportunity loss for the best alternative
80. The expected value of sample information (EVSI) is the difference between-
: The expected monetary value with additional information (EMV') and the expected monetary value for the best decision (EMV*)
81.The procedure for revising probabilities based upon additional information is
referred to as: Bayes' Law
82.The difference between expected payoff under certainty and expected val- ue of the
best act without certainty is the: Expected value of perfect information
