Hypothesis testing always assumes that ________

Question 1.1. Two-tailed tests ________. (Points : 1)

have only lower critical values

have only upper critical values

have both upper and lower critical values

do not have any critical values

Question 2. 2. Hypothesis testing always assumes that ________. (Points : 1)

the alternative hypothesis is true

the null hypothesis is true

the probability of the null hypothesis being true is less than 50%

the probability of the alternative hypothesis being true is less than 50%

Question 3. 3. The power of the test represents the ________. (Points : 1)

probability of correctly failing to reject the null hypothesis when it is indeed true

probability of incorrectly rejecting the null hypothesis when it is actually true

probability of incorrectly failing to reject the null hypothesis when it is actually false

probability of correctly rejecting the null hypothesis when it is indeed false

Question 4. 4. The power of the test has a value of ________. (Points : 1)

1 - a

1 + ß

1 - ß

a - ß

Question 5. 5. The null hypothesis ________. (Points : 1)

describes an existing theory or belief that is accepted as correct in the presence of contradictory data

describes an existing theory or belief that is accepted as correct in the absence of contradictory data

is based on new information provided by sample data

is based on new information provided by population data

Question 6. 6.

Use the information below to answer the question.

The following table provides data on a sample of customers who visited a local restaurant. The restaurant owner believes that the average profit per customer exceeds $25.

36.73

35.50

25.92

38.36

41.65

25.50

18.78

19.78

33.14

22.22

20.85

26.23

22.13

32.33

28.46

34.15

34.72

24.21

24.20

28.95

21.84

19.74

20.75

Which of the following is the correct conclusion? (Points : 1)

The null hypothesis that the average profit per customer exceeds $25 cannot be rejected.

The null hypothesis that the average profit per customer does not exceed $25 is rejected.

The null hypothesis that the average profit per customer does not exceed $25 cannot be rejected.

The null hypothesis that the average profit per customer exceeds $25 is rejected.

Question 7. 7. In most practical applications, the population standard deviation will not be known but it is estimated from the ________. (Points : 1)

population

sample

test statistic

t-distribution

Question 8. 8. The t-Test Statistic has a t distribution with ________ degrees of freedom. (Points : 1)

n + 1

n - 2

n - 1

Question 9. 9. The confidence coefficient is ________. (Points : 1)

the probability of correctly failing to reject the null hypothesis

the probability of making a Type II error

the probability of making a Type I error

the probability of correctly rejecting the null hypothesis

Question 10. 10. Which of the following is not an appropriate alternative hypothesis for the null hypothesis, H0: mean production cost = $2.00? (Points : 1)

H1: mean production cost > $2.00

H1: mean production costs < $2.00

H1: mean production costs = $2.00

H1: mean production costs ? $2.00

Question 11. 11. If the null hypothesis is false, it is more likely that the test statistic will ________. (Points : 1)

fall into the nonrejection region

not follow the uniform distribution

fall into the rejection region

not follow the normal distribution

Question 12. 12. The hypothesized sampling distribution of the test statistic is divided into ________ parts. (Points : 1)

four

two

six

three

Question 13. 13. To assess the effect of an intervention such as the productivity of an employee before and after a training class, one would conduct a(n) ________. (Points : 1)

independent samples t-test

ANOVA

paired samples t-test

F-test

Question 14. 14.

Use the below information to answer the question.

A company wishes to test whether the proportion of female managers is the same as the proportion of male managers. The following table provides data for a sample of employees.

Females

Males

Number of managers

Sample size

Identify the p-value. (Points : 1)

0.1483

0.2966

0.8517

0.7034

Question 15. 15. If the confidence coefficient is 0.9, ________. (Points : 1)

we expect that 9 samples out of 100 will support the null hypothesis

we expect that 90 out of 100 samples will support the null hypothesis

we expect that 10 samples out of 100 will support the null hypothesis

we expect that all 100 samples will support the null hypothesis

Question 16. 16. The probability of making a Type I error is generally denoted by ________. (Points : 1)

Question 17. 17. A helpful analogy of hypothesis testing might be the concept of ________. (Points : 1)

the U.S. legal system-innocent until proven guilty

better safe than sorry.

the theory of relativity

the central limit theorem

Question 18. 18. The power of the test depends on ________. (Points : 1)

the true value of the population mean

the level of confidence used

the sample size

all of the above

Question 19. 19. Statistical inference is the process of drawing conclusions about ________ from sample data. (Points : 1)

surveys

populations

individuals

sampling errors

Question 20. 20.