QNT/561 Final exam 100% Correct
1) Which of the following measures of central location is affectedmost by extreme values?
A. Mean
B. Median
C. Mode
D. Geometric mean
2) Which level of measurement is required for the median?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
3) Which level of measurement is required for the mode?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
4) In a set of observations, which measure of central tendencyreports the value that occurs most often?
A. Mean
B. Median
C. Mode
D. Geometric mean
5) The weighted mean is a special case of what?
A. Mean
B. Median
C. Mode
D. Geometric mean
6) A sample of 5 companies were examined for changes in theirrelative market share. The results showed the following increasesand decreases: â5, 10, 10, 5, â10.
A. 8
B. 2
C. -2
D. 6
7) The difference between the sample mean and the population meanis called the
A. margin of error
B. population standard deviation
C. standard error of the mean
D. sampling error
8) A local trade union consists of plumbers and electricians.Classified according to rank:
Apprentice Journeyman Master Total
Plumbers 25 20 30 75
Electricians 15 40 20 75
40 60 50
A member of the union is selected at random. Given that the personselected is an electrician, what is the probability that the personis a master?
A. .053
B. .133
C. .500
D. .267
9) Suppose a population consisted of 20 items. How many differentsamples of n = 3 are possible?
A. 6840
B. 1140
C. 20
D. 120
10) The mean and the variance are equal in
A. the normal distribution
B. the binomial distribution
C. the Poisson distribution
D. the hypergeometric distribution
11) In the 1936 Presidential Election Franklin D. Rooseveltdefeated Alfred E. Landon in a landslide vote. A Landon victory hadbeen predicted by the Literary Digest, a magazine that ran theoldest, largest, and most widely publicized of the polls at thetime. The Digest’s final prediction was based on 10 million sampleballots mailed to prospective voters, and 2.3 million werereturned. The sample of voters was drawn from lists of automobileand telephone owners. Despite the massive size of this sample, itfailed to predict a Roosevelt victory, being off the mark by 19percentage points. The Digest was wrong because
A. the sample size, although large, was not large enough
B. the right research questions were not asked
C. respondents intentionally lied about their preferredcandidate
D. the sample used was not representative of the actual populationat the time
12) In a study on the effect of reinforcement on learning from acompany online training program, two experimental treatments areplanned: reinforcement given after every learning module, orreinforcement given after every two learning modules. Reinforcementis accomplished with the addition of more examples. Which one ofthe following control groups would serve best in this study?
A. A group that does not read any of the learning modules.
B. A group that reads the modules using hardcopy only.
C. A group that reads the learning modules, but does not receivereinforcement.
D. A group that reads the learning modules with randomreinforcement.
13) The central limit theorem is important to market researchersbecause it states that as sample sizes increase, the distributionof the sample ________ collected from consumers on any topic ofinterest being researched approaches the normal distribution.
A. medians
B. means
C. standard deviations
D. variances
14) To find confidence intervals for the mean of a normaldistribution, the t distribution is usually used in practicalapplications instead of the standard normal distributionbecause
A. the mean of the population is not known
B. the t distribution is more effective
C. the variance of the population is usually not known
D. the sample size is not known
15) We wish to develop a confidence interval for the populationmean. The population follows the normal distribution, the standarddeviation of the population is 3, and we have a sample of 10observations. We decide to use the 90% level of confidence. Theappropriate value of to represent the level of confidence is
A. z=1.65
B. z=1.96
C. z=1.833
D. z=1.812
16) Which of the following is a correct statement about aprobability?
A. It may range from 0 to 1.
B. It may assume negative values.
C. It may be greater than 1.
D. It cannot be reported to more than 1 decimal place.
17) The special rule of addition is used to combine
A. independent events
B. mutually exclusive events
C. events that total more than one
D. events based on subjective probabilities
18) We use the general rule of multiplication to combine
A. events that are not independent
B. mutually exclusive events
C. events that total more than 1.00
D. events based on subjective probabilities
19) A discrete variable
A. is an example of a qualitative variable
B. can assume only whole number values
C. can assume only certain clearly separated values
D. cannot be negative
20) A nominal scale variable
A. usually involves ranking.
B. cannot assume negative values
C. has meaningful zero point
D. is usually based on counting
21) The ratio scale of measurement
A. usually the result of counting something
B. has meaningful zero point
C. may assume negative values
D. cannot have more than two categories
22) In the world of market research, the use of a questionnaireoften plays a vital role in gaining useful business intelligencebecause
A. it is a structured technique to collect secondary data
B. it represents a way to ask anything you want from respondentsand receive valid information
C. it does not need to be tested
D. it can be used in conjunction with other techniques such asfield interviews and focus groups to maximize data input
23) A Type I error is
A. the correct decision
B. a value determined from the test statistic
C. rejecting the null hypothesis when it is true
D. accepting the null hypothesis when it is false
24) In a two-sample test of means for independent samples, we usethe z distribution when
A. the population standard deviations are equal
B. both populations have at least 4,000 observations
C. both population standard deviations are known
D. nB and n(1-B) are both greater than 5
25) Which of the following is a requirement for a two-sample testof proportions?
A. The population standard deviations are equal.
B. Both populations are positively skewed.
C. Both samples are at least 30.
D. nB and n(1-B) are both greater than 5.
26) Bob is interested in opening a candy store in his town. Hebelieves that his customers will spend an average of $75 or more inannual purchases (the alternative hypothesis). Bob hires aconsultant to test this belief. The consultant tested thisconjecture on a sample of 100 customers and found the p-value forthe test statistic satisfied p > .25, then
A. you would not reject the null hypothesis
B. you would reject the null hypothesis for alpha= .01
C. you would reject the null hypothesis for alpha= .05
D. you would reject the null hypothesis for alpha= .10
27) A carefully designed business experiment has just beenconcluded. Unfortunately, use of alpha = .05 indicated nosignificant differences among four treatments. What usefulinformation can you supply future investigators when you report onthis experiment?
A. The means are different but their variances are the same.
B. The estimated variance (and its df) can be useful to futureinvestigators.
C. Pair-wise tests can be conducted to show significantdifferences.
D. Significant differences can be reported by changing the type Ierror rate from .05 to .10, .20, or whatever is needed to declaresignificance.
28) A correlation matrix
A. shows all simple coefficients of correlation betweenvariables
B. shows only correlations that are zero
C. shoes the correlations that are positive
D. shows only the correlations that are statisticallysignificant
29) The multiple standard error of estimate is
A. the measure of variability to the prediction
B. negative when one of the net regression coefficients is zero
C. found by calculating SSR/SS total
D. the measure of accuracy of the prediction
30) A dummy variable or indicator variable
A. may assume only a value of 0 or 1
B. is another term for the dependent variable
C. is a quantitative variable
D. is a variable at a ratio or interval level of measurement
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