10.2

7.

  1. 2.31
  2. .0104
  3. Since 2.31 is greater than 1.645 we reject the null hypothesis and since .0104 is less than .05 we also reject the null hypothesis.

9.

  1. -.74
  2. .229

  3. Since -.74 is greater than -2.33 we fail to reject the null hypothesis and because .2296 is greater than .05 we also fail to reject the null hypothesis. 11.

  4. -1.49
  5. .1362

  6. Since -1.49 does not lie in the critical region we fail to reject the null hypothesis and because .1362 is greater than .05 we fail to reject the null hypothesis.

13.

A p-value of .2743 would mean that the expected results would be approximately 27 or 28 out of 100 samples. Because it is less than the level of significance it is not unusual, and we fail to reject the null hypothesis.

15.

  1. .4720

Ho: p = .5

H1: p < .5

  1. np(1-p)>10 678(.5)(1-.5)>10 169.5>10

  2. Skip

  3. .0735

  4. If the null hypothesis is true, results would be found in approximately 7 or 8 of 100 samples,

  5. We fail to reject the null hypothsis because .0735 > .05.

17.

  1. .2578

  2. Since .2578 is greater than .01, we fail to reject the null hypothesis. There is no significant evidence to prove that more than 1.9% of Lipitor users experience flulike symptoms as a side effect.

19.

  1. .0036
  2. Since .0036 is less than .05 we reject the null hypothesis. There is sufficient evidence to prove that Hawaii has a higher proportion of traffic fatalities involving a positive BAC.