10.3

1.

  1. 2.602

  2. -1.729

  3. +/-2.179

2.

  1. 1.321

  2. 22.164

  3. 2.733

3.

  1. -1.38

  2. -1.645

  3. skip

  4. No because the test statistic falls within the critical values of a=0.05

4.

  1. 2.67

  2. 2.06

  3. skip

  4. Yes because the test statistic falls outside of the range of the CV

5.

  1. 2.50

  2. 2.57

  3. skip

  4. No because it falls within the CV

  5. Type answer here.

11.

Ho: mean withdrawal Crown = mean withdrawal PayEase

H1: Crown < PayEase

  1. The p-value of 0.02 means that the null hypothesis is very unlikely and therefore must be rejected.

  2. We are 95% positive that the null hypothesis is not true and therefore are able to accept the alternative hypothesis.

13.

Ho: u = 22

H1: u > 22

  1. n=200>30 and normally distributed

  2. p=0.02; Reject Ho

  3. Since the p-value generated from the sample falls below the significance level, there is sufficient evidence to reject the null hypothesis.

15.

Considering the p-value is nearly 0, there is sufficient evidence to reject the null hypothesis that alcohol has no effect on the volume of the hippocampal region of the brain in adolescents.

17.

The p-value of 0.21 is significantly greater than the significance level of a=0.05, therefore we can accept the null hypothesis as true.

19.

The 95% CI is (35.439, 42.361). Since the CI contains the mean age from 2002, 40.7, we can assume the age has not changed.

10.4

1.

  1. 1.734

  2. 1.321

  3. 3.038

3.

  1. 20.496

  2. df=23, CV=13.091

  3. Skip but feel free to sketch on a piece of paper for your benefit.

  4. No because the test statistic is not in the critical region

13. Feel free to use any method you want. If you use the classical method please report the value of your test statistic and your decision. Likewise if you use the pvalue method please state your pvalue and your decision. Hint: The sample standard deviation (s) is 15.20.

p=0.3025 Do not reject Ho. Not enough evidence to show the wait time is less than 18.0 sec.

15. Feel free to use any method you want. If you use the classical method please report the value of the test statistic and your decision. Likewise if you use the pvalue method please state your pvalue and your decision.

p=0.0993 Reject Ho. There is enough evidence to prove Rose is more consistent.