10.1

9.

Right tailed, mew

10.

left tailed, p

11.

two tailed, standard deviation

12.

right tailed, p

13.

left tailed, mew

14.

two tailed, standard deviation

15.

Ho: p = 0.399

H1: p > 0.399

17.

Ho: mew = $245,700

H1: mew < $245,700

19.

Ho: standard deviation = 0.7 psi

H1: standard deviation < 0.7 psi

21.

Ho: mew = $48.79

H1: mew =/ $48.79

10.2

7.

  1. 2.31
  2. 0.0104
  3. Critical value = 1.645. Because test statistic is greater than the critical value, reject the null hypothesis Because P = 0.0104 is less than the level of significance, reject the null hypothesis.

9.

  1. -0.74
  2. 0.2296
  3. Because the p value is greater than the level of significance, do not reject the null hypothesis.

11.

  1. -1.49
  2. 0.1362
  3. Because the p value is greater than the level of significance, do not reject the null hypothesis

13.

The p value of 0.2743 means that if the null hypothesis is true, this type of result would be expected in about 27-28 of out every 100 samples. Because the p value is so large, do not reject the null hypothesis.

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

  1. 320/678 = 0.472

Ho: p = 0.5

H1: p < 0.5

  1. Z0 = -1.45, Because 0.0735 > 0.5, do not reject the null hypothesis

17.

  1. p value = 0.2582

  2. Do not reject the null hypothesis.

19.

  1. p value = 0.0036

  2. Since 0.0036 < 0.05, reject the null hypothesis