10.1

9.

Right tailed, mew

10.

left-tailed, proportion

11.

two-tailed, standard deviation

12.

right-tailed, proportion

13.

left-tailed, mew

14.

two-tailed, standard deviation

15.

Ho: p = 0.339

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 does not equal $48.79

10.2

7.

  1. np0 (1-p0) = 42 > 1
  2. 0.0104
  3. There is sufficient evidence at the beta = 0.05 level of significance to reject the null hypothesis.

9.

  1. np0 (1-p0) = 37.1 > 10
  2. 0.2296
  3. There is not sufficient evidence at the beta = 0.10 level of significance to reject the null hypothesis.

11.

  1. np0 (1-p0) = 45 > 10
  2. 0.1362
  3. There is not sufficient evidence at the beta = 0.05 level of significance to reject the null hypothesis.

13.

About 27 in 100 samples will give a sample proportion as high or highter than the one obtained if the population proportion really is 0.5. Because this probability is not small, we do not reject the null hypothesis. There is not sufficient evidence to conclude that the dart-packing strategy resulted in a majority of owners. 15. Note this is slightly modified version of the book problem Just answer a) b) and c) fromt the skeleton.

  1. P hat = 0.472

Ho: p = 0.5

H1: p < 0.5

  1. np0(1-p0) = 169.5 > 10. The sample size is less than 5% of the population size, provided Cramer has made more than 13,560 predictions.

17.

  1. p-value = 0.2578 > beta = 0.01

  2. There is not sufficient evidence at the beta = 0.01 level of significance to conlcude that more than 1.9% of Lipitor users experience flulike symptoms as a side effect.

19.

  1. p - value = 0.0036 < beta = 0.05

  2. There is sufficient evidence at the beta = 0.05 level of significance to conclude Hawaii has a higher proportion of traffic fatalities in which the driver has a positive BAC than in the U.S.