10.1

9.

right-tailed, mieux

10.

left-tailed, p

11.

two-tailed, sigma

12.

right-tailed, p

13.

left-tailed, mieux

14.

two-tailed, sigma

15.

Ho: p = .399

H1: p > .399

17.

Ho: m = $245,700

H1: m < $245,700

19.

Ho: sigma = .7 psi

H1: sigma < .7 psi

21.

Ho: m = $48.79

H1: m does not equal $48.79

10.2

7.

  1. z = 2.31
  2. .0104 = P
  3. reject Ho because the test statistic is greater than 1.645.

9.

  1. z = -.74
  2. P = .2296
  3. p value greater (.2296) is greater than the level of significance, I fail to reject the null hypothesis.

11.

  1. z = -1.49
  2. P = .1362
  3. P value greater than the the level of significance, fail to reject null hypothesis.

13.

P value of .2743 means that if the null hypothesis is true, then this type of result would be expected in 27-28 out of 100 samples. The samples that were observed are not unusual. P value is large, fail to reject null hypothesis.

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

  1. .472

Ho: p = .5

H1: p < .5

  1. z = -1.45 P value .0722. Fail to reject the null hypothesis.

17.

  1. z = .65 and P = .3578

  2. Fail to reject null hypothesis since .2578>.0. Not sufficient evidence to conclude that more than 1.9% of Lipitor users experience flulike symptoms as a side effect.

19.

  1. z = 2.69 and P = .0036

  2. .0036 < .05, so reject the hull hypothesis. Sufficient evidence to conclude that HI has a higher proportion of traffic deaths involving positive BAC’s than the rest of the US.