1. Statistics
Chapter 7 Review

2. Left-tailed Right-tailed Two-tailed
A car maker claims that its new sub-compact car gets better than 49 miles per gallon on the highway. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed.
Left-tailed
Right-tailed
Two-tailed

3. The mean age of bus drivers in Chicago is 48. 9 years
The mean age of bus drivers in Chicago is 48.9 years. If a hypothesis test is performed, how should you interpret a decision that fails to reject the null hypothesis?
There is not enough evidence to reject the claim.
There is sufficient evidence to reject the claim.
There is no enough evidence to support the claim.
There is sufficient evidence to support the claim.

4. Find the critical value for a two-tailed test with a α = 0
Find the critical value for a two-tailed test with a α = 0.01 and n = 30.
± 1.645
± 1.96
± 2.33
± 2.575

5. You wish to test the claim that 47 at a significance level of α= 0
You wish to test the claim that 47 at a significance level of α= 0.01 and are given sample statistics n = 40, mean = 48.8, and s = Compute the value of the standardized test statistic.
3.51
1.96
2.12
2.65

6. Suppose you are using α = 0
Suppose you are using α = 0.01 to test the claim that μ ≤ 40 using a P-value. You are given the sample statistics n = 40, mean = 41.8, and s = Find the P-value.
0.0211
0.1030
0.0040
0.9960

7. Given Ha: μ > 85 and P = Do you reject or fail to reject Ho at the 0.01 level of significance?
Reject Ho
Fail to reject Ho
Not sufficient information to decide.

8. Find the standardized test statistic t for a sample with n = 15, mean = 6.4, and s = 0.8, and α = 0.05 if Ho: μ ≤ 6.1.
1.631
1.312
1.728
1.452

9. Determine whether the normal sampling distribution can be used
Determine whether the normal sampling distribution can be used. The claim is p ≠ and the sample size is n = 20.
Do not use the normal distribution.
Use the normal distribution.

10. Find the critical χ2-value to test the claim σ2 ≥ 1
Find the critical χ2-value to test the claim σ2 ≥ 1.8 if n = 15 and α = 0.05.
4.660
6.571
5.629
4.075

11. Compute the standardized test statistic, χ2, to test the claim σ2 > 15.2 if n = 18, s2 = 21.6, and α = 0.01.
24.158
28.175
43.156
33.233