Transcript ch 07 learning

State the null and alternative hypotheses.
A company claims the mean lifetime of its
AA batteries is more than 16 hours.
A. H0: μ > 16 Ha: μ ≤ 16
B. H0: μ < 16 Ha: μ ≥ 16
C. H0: μ ≤ 16 Ha: μ > 16
D. H0: μ ≥ 16 Ha: μ < 16
State the null and alternative hypotheses.
A company claims the mean lifetime of its
AA batteries is more than 16 hours.
A. H0: μ > 16 Ha: μ ≤ 16
B. H0: μ < 16 Ha: μ ≥ 16
C. H0: μ ≤ 16 Ha: μ > 16
D. H0: μ ≥ 16 Ha: μ < 16
State the null and alternative hypotheses.
A student claims the mean cost of a
textbook is at least $125.
A. H0: μ > 125 Ha: μ ≤ 125
B. H0: μ < 125 Ha: μ ≥ 125
C. H0: μ ≤ 125 Ha: μ > 125
D. H0: μ ≥ 125 Ha: μ < 125
State the null and alternative hypotheses.
A student claims the mean cost of a
textbook is at least $125.
A. H0: μ > 125 Ha: μ ≤ 125
B. H0: μ < 125 Ha: μ ≥ 125
C. H0: μ ≤ 125 Ha: μ > 125
D. H0: μ ≥ 125 Ha: μ < 125
True or false:
Testing the claim that at least 88% of
students have a cell phone would be a
right-tail test.
A. True
B. False
True or false:
Testing the claim that at least 88% of
students have a cell phone would be a
right-tail test.
A. True
B. False
You are testing the claim that the mean cost of a
new car is more than $25,200. How should you
interpret a decision that rejects the null
hypothesis?
A. There is enough evidence to reject the claim.
B. There is enough evidence to support the
claim.
C. There is not enough evidence to reject the
claim.
D. There is not enough evidence to support the
claim.
You are testing the claim that the mean cost of a
new car is more than $25,200. How should you
interpret a decision that rejects the null
hypothesis?
A. There is enough evidence to reject the claim.
B. There is enough evidence to support the
claim.
C. There is not enough evidence to reject the
claim.
D. There is not enough evidence to support the
claim.
True or false:
Given H0: μ = 40 Ha: μ ≠ 40 and P = 0.0436.
You would reject the null hypothesis at the
0.05 level of significance.
A. True
B. False
True or false:
Given H0: μ = 40 Ha: μ ≠ 40 and P = 0.0436.
You would reject the null hypothesis at the
0.05 level of significance.
A. True
B. False
Find the critical value, z0, for a left-tailed
test at the 0.10 level of significance.
A. z0 = –1.645
B. z0 = 1.645
C. z0 = –1.28
D. z0 = 1.28
Find the critical value, z0, for a left-tailed
test at the 0.10 level of significance.
A. z0 = –1.645
B. z0 = 1.645
C. z0 = –1.28
D. z0 = 1.28
Find the standardized test statistic z for the
following situation:
Claim: μ >15; x  13.6 s = 3.4
A. z = 2.60
B. z = –2.60
C. z = –0.07
D. z = 12.90
n = 40
Find the standardized test statistic z for the
following situation:
Claim: μ >15; x  13.6 s = 3.4
A. z = 2.60
B. z = –2.60
C. z = –0.07
D. z = 12.90
n = 40
Find the critical value(s), t0, for a two-tailed
test, α = 0.05, and n = 8.
A. –t0 = –1.96 and t0 = 1.96
B. –t0 = –2.306 and t0 = 2.306
C. –t0 = –1.895 and t0 = 1.895
D. –t0 = –2.365 and t0 = 2.365
Find the critical value(s), t0, for a two-tailed
test, α = 0.05, and n = 8.
A. –t0 = –1.96 and t0 = 1.96
B. –t0 = –2.306 and t0 = 2.306
C. –t0 = –1.895 and t0 = 1.895
D. –t0 = –2.365 and t0 = 2.365