10.1

9.

Right-Tailed

10.

Left-Tailed

11.

Two-Tailed

12.

Right-Tailed

13.

Left-Tailed

14.

Two-Tailed

15.

Ho: p = 0.399

H1: p > 0.399

17.

Ho: mean = $245,700

H1: mean < $245,700

19.

Ho: standard deviation = 0.7psi

H1: standard deviation < 0.7psi

21.

Ho: mean = $48.79

H1: mean does not equal $48.79

10.2

7.

  1. 2.31
  2. 0.0108
  3. Reject the null hypothesis

9.

  1. -.74
  2. .2296
  3. Fail to reject the null hypothesis

11.

  1. -1.38
  2. .0838
  3. Reject the null hypothesis

13.

27 in 100 samples will give a sample proportion as high or higher than the one obtained if the population proportion actually is 0.5. The probability is not small, so we fail to reject the null hypothesis. There isn’t sufficient evidence to conclude that the dart picking strategy resulted in a majority of winners.

15. Note this is slightly modified version of the book problem Just answer a) b) and c) from the skeleton.

  1. 0.472

Ho: p = 0.5

H1: p < .05

  1. -2.92 and Fail to reject null hypothesis

17.

  1. 0.2578

  2. Fail to reject the null hypothesis

19.

  1. pvalue = 0.0036

  2. Reject null hypotheisis