QBA EXAM 2 UPDATED QUESTIONS
AND CORRECT ANSWERS.
Two approaches to drawing a conclusion in a hypothesis test are _____. - ANS a. p-value and
critical value
A Type I error is committed when _____. - ANS c. a true null hypothesis is rejected
What are the two decisions that you can make from performing a hypothesis test? - ANS a.
Reject the null hypothesis; Fail to reject the null hypothesis
A null and alternative hypothesis for a one proportion z test are given as H0: p ≥ 0.8, Ha: p < 0.8.
This hypothesis test is _____ - ANS c. lower-tailed
A pizza shop advertises that they deliver in 30 minutes or less or it is free. People who live in
homes that are located on the opposite side of town believe it will take the pizza shop longer
than 30 minutes to make and deliver the pizza. Write the null and alternative hypotheses that
can be used to conduct a significance test. - ANS a. H0: u ≤ 30, Ha: u > 30
The average number of hours for a random sample of mail order pharmacists from company A
was 50.1 hours last year. It is believed that changes to medical insurance have led to a
reduction in the average work week. To test the validity of this belief, the hypotheses are
_____. - ANS b. H0: u ≥ 50.1, Ha: u < 50.1
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, The owners of a fast food restaurant have automatic drink dispensers to help fill orders more
quickly. When the 12 ounce button is pressed, they would like for exactly 12 ounces of
beverage to be dispensed. There is, however, some variation in this amount. The company does
not want the machine to systematically over fill or under fill the cups. Which of the following
gives the correct set of hypotheses? - ANS c. H0: u = 12, Ha: u ≠ 12
Determine whether the alternative hypothesis is left-tailed, right-tailed, or two-tailed: H0: μ =
11, Ha: μ > 11. - ANS b. Right-tailed
Which statement is NOT true?
a. The greater the level of confidence, the larger the z-score.
b. Rejecting the null hypothesis when it is true is a Type II error.
c. The greater the level of confidence, the wider the confidence interval.
d. The greater the level of confidence, the more likely it is that the confidence interval actually
includes the true population mean. - ANS b. Rejecting the null hypothesis when it is true is a
Type II error.
Which statement is NOT true?
a. Failing to reject the null hypothesis when it is false is a Type I error.
b. The probability of making a Type I error is symbolized by α.
c. Type II error can occur for both one and two-tailed tests.
d. Rejecting the null hypothesis when it is true is a Type I error. - ANS a. Failing to reject the
null hypothesis when it is false is a Type I error.
A student wants to determine if pennies are really fair when flipped, meaning equally likely to
land heads up or tails up. He flips a random sample of 50 pennies and finds that 28 of them land
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AND CORRECT ANSWERS.
Two approaches to drawing a conclusion in a hypothesis test are _____. - ANS a. p-value and
critical value
A Type I error is committed when _____. - ANS c. a true null hypothesis is rejected
What are the two decisions that you can make from performing a hypothesis test? - ANS a.
Reject the null hypothesis; Fail to reject the null hypothesis
A null and alternative hypothesis for a one proportion z test are given as H0: p ≥ 0.8, Ha: p < 0.8.
This hypothesis test is _____ - ANS c. lower-tailed
A pizza shop advertises that they deliver in 30 minutes or less or it is free. People who live in
homes that are located on the opposite side of town believe it will take the pizza shop longer
than 30 minutes to make and deliver the pizza. Write the null and alternative hypotheses that
can be used to conduct a significance test. - ANS a. H0: u ≤ 30, Ha: u > 30
The average number of hours for a random sample of mail order pharmacists from company A
was 50.1 hours last year. It is believed that changes to medical insurance have led to a
reduction in the average work week. To test the validity of this belief, the hypotheses are
_____. - ANS b. H0: u ≥ 50.1, Ha: u < 50.1
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, The owners of a fast food restaurant have automatic drink dispensers to help fill orders more
quickly. When the 12 ounce button is pressed, they would like for exactly 12 ounces of
beverage to be dispensed. There is, however, some variation in this amount. The company does
not want the machine to systematically over fill or under fill the cups. Which of the following
gives the correct set of hypotheses? - ANS c. H0: u = 12, Ha: u ≠ 12
Determine whether the alternative hypothesis is left-tailed, right-tailed, or two-tailed: H0: μ =
11, Ha: μ > 11. - ANS b. Right-tailed
Which statement is NOT true?
a. The greater the level of confidence, the larger the z-score.
b. Rejecting the null hypothesis when it is true is a Type II error.
c. The greater the level of confidence, the wider the confidence interval.
d. The greater the level of confidence, the more likely it is that the confidence interval actually
includes the true population mean. - ANS b. Rejecting the null hypothesis when it is true is a
Type II error.
Which statement is NOT true?
a. Failing to reject the null hypothesis when it is false is a Type I error.
b. The probability of making a Type I error is symbolized by α.
c. Type II error can occur for both one and two-tailed tests.
d. Rejecting the null hypothesis when it is true is a Type I error. - ANS a. Failing to reject the
null hypothesis when it is false is a Type I error.
A student wants to determine if pennies are really fair when flipped, meaning equally likely to
land heads up or tails up. He flips a random sample of 50 pennies and finds that 28 of them land
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
