Calculus and Above

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19) A discrete variable A....

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 questionnaire often plays a vital role in gaining useful business intelligence because:

A. it is a structured technique to collect secondary data

B. it represents a way to ask anything you want from respondents and receive valid information

C. it does not need to be tested

D. it can be used in conjunction with other techniques such as field 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 use the 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 test of 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. He believes that his customers will spend an average of $75 or more in annual purchases (the alternative hypothesis). Bob hires a consultant to test this belief. The consultant tested this conjecture on a sample of 100 customers and found the p-value for the test statistic satisfied p > 0.25, then

A. you would not reject the null hypothesis

B. you would reject the null hypothesis for alpha= 0.01

C. you would reject the null hypothesis for alpha= 0.05

D. you would reject the null hypothesis for alpha= 0.10

27) A carefully designed business experiment has just been concluded. Unfortunately, use of alpha = .05 indicated no significant differences among four treatments. What useful information can you supply future investigators when you report on this experiment?

A. The means are different but their variances are the same.

B. The estimated variance (and its df) can be useful to future investigators.

C. Pair-wise tests can be conducted to show significant differences.

D. Significant differences can be reported by changing the type I error rate from .05 to .10, .20, or whatever is needed to declare significance.

28) A correlation matrix

A. shows all simple coefficients of correlation between variables

B. shows only correlations that are zero

C. shoes the correlations that are positive

D. shows only the correlations that are statistically significant

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

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 questionnaire often plays a vital role in gaining useful business intelligence because:

A. it is a structured technique to collect secondary data

B. it represents a way to ask anything you want from respondents and receive valid information

C. it does not need to be tested

D. it can be used in conjunction with other techniques such as field 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 use the 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 test of 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. He believes that his customers will spend an average of $75 or more in annual purchases (the alternative hypothesis). Bob hires a consultant to test this belief. The consultant tested this conjecture on a sample of 100 customers and found the p-value for the test statistic satisfied p > 0.25, then

A. you would not reject the null hypothesis

B. you would reject the null hypothesis for alpha= 0.01

C. you would reject the null hypothesis for alpha= 0.05

D. you would reject the null hypothesis for alpha= 0.10

27) A carefully designed business experiment has just been concluded. Unfortunately, use of alpha = .05 indicated no significant differences among four treatments. What useful information can you supply future investigators when you report on this experiment?

A. The means are different but their variances are the same.

B. The estimated variance (and its df) can be useful to future investigators.

C. Pair-wise tests can be conducted to show significant differences.

D. Significant differences can be reported by changing the type I error rate from .05 to .10, .20, or whatever is needed to declare significance.

28) A correlation matrix

A. shows all simple coefficients of correlation between variables

B. shows only correlations that are zero

C. shoes the correlations that are positive

D. shows only the correlations that are statistically significant

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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