10.3

1.

  1. 2.602

  2. -1.729

    • or - 2.179

2.

  1. 1.321

  2. -2.426

    • or - 2.738

3.

  1. -1.379

  2. -1.714

  3. skip

  4. do not reject the null hypothesis

4.

  1. 2.674

  2. 1.318

  3. skip

  4. reject the null hypothesis

5.

  1. 2.513

    • or - 2.819

  3. skip

  4. do not reject the null hypothesis

  5. 99.39 to 110.2068

11.

Ho: mean = 67

H1: mean > 67

  1. There is a .02 probability that the sample mean will be

  2. Type answer here.

13.

Ho: mean = 22

H1: mean > 22

  1. It’s a random sample, n is greater than 30, and it’s small relative to the population size

  2. 2.1757

  3. reject the null hypothesis

15.

test statistic value is -4.55 and t alpha is -2.718 reject the null hypothesis because the test statistic is smaller than the critical value point

17.

test statistic value is .8133 and t alpha is 1.685 you cannot reject the null hypothesis because the test statistic is smaller

19. The confidence interval is 37.2381 to 44.1619

10.4

1.

  1. 1.734

  2. 1.321

    • or - 2.045

3.

  1. chi squared = 20.496

  2. 13.091

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

  4. you cannot reject the null hypothesis

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.

test statistic = 6.422 and chi squared of the alpha value = 3.325 so the null hypothesis cannot be rejected

Type answer here.

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.

test statistic = 15.639 and chi squared of the alpha value = 15.659

the null hypothesis can be rejected