1
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QBA Exam 2 Questions and Answers
(100% Correct Answers) Already Graded
A+
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
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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
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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
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
, 2
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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.
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c. The greater the level of confidence, the wider the confidence
interval.
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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
heads up. If p denotes the true probability of a penny landing
For Expert help and assignment solutions, +254707240657
QBA Exam 2 Questions and Answers
(100% Correct Answers) Already Graded
A+
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
© 2025 Assignment Expert
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
Guru01 - Stuvia
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
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
, 2
For Expert help and assignment solutions, +254707240657
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.
© 2025 Assignment Expert
c. The greater the level of confidence, the wider the confidence
interval.
Guru01 - Stuvia
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
heads up. If p denotes the true probability of a penny landing
