10.3

1.

  1. 2.602

  2. -1.729

  3. plus and minus 2.179

2.

  1. 1.323

  2. -2.426

  3. plus and minus 2.738

3.

  1. test statistic = -1.379

  2. critical value is -1.714

  3. skip

  4. fail to reject the null because the test statistic is not within the critical value.

4.

  1. test statistic = 2.67

  2. critical value = 1.318

  3. skip

  4. reject null because test statistic is within the critical region.

5.

  1. test statistic = 2.502

  2. critical value = plus and minus 2.819

  3. skip

  4. fail to reject null because the test statistic is not within the critical region

  5. confidence interval (99.393, 110.2)

11.

Ho: pop mean = 67

H1: pop mean > 67

  1. p value 0.02 means that if the null hypothesis is true, this type of result would be expected in 2 out of 100 people.

  2. reject the null because p value 0.02 is less than alpha value 0.05.

13.

Ho: pop mean = 22.6

H1: pop mean > 22.6

  1. it does not mention if the sample size is normal but the sample is greater than 30 and the requirement is that it has to be greater than or equal to 30.

  2. the critical value with the classical method is 1.66 and the p value with the p value method is 0.02.

  3. 2.176 test statistic is within the critical region and p value 0.02 is less than alpha 0.05 so reject the null.

15.

test statistic is -4.553. The critical value is -2.718. test statistic within critical region so reject the null. This means that there is evidence to conclude that hippocampal volumes in alcohilic adolescents are less than normal volume of 9.02 cm^3.

17.

the test statistic is 0.813. the critical value is 1.685. The test statistic does not fall within the critical value so we fail to reject the null. There is not sufficient evidence to support that high income individuals have higher credit scores.

19.

95% confidence interval is (35.439, 42.361). 40.7 is within this interval so the mean has not changed so we fail to reject the null hypothesis.

10.4

1.

  1. critical value is 28.869

  2. critical value is 14.041

  3. the critical values are 16.047 and 45.722

3.

  1. test statistic = 20.496

  2. the critical value is 13.091

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

  4. fail to reject the null because the test statistic is not within 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.

the test statistic is 6.418 and the critical value is 3.325. We fail to reject the null because the test statistic is not within the critical region. There is not sufficient evidence to conclude that the wait time has decreased below 18 seconds.

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.

the test statistic is 15.639. The critical value is 15.658. we reject the null hypothesis becuase the test statistic is within the critical region. This means that there is evidence to support that derrick rose is more consistent than other shooting guards.