10.2

7.

  1. np0(1-p0)=42>10 a) classical approach:z0>2.31>z0.05=1.645
  2. P-value approach: P-value=0.0104 < ?? = 0.05.
  3. Reject the null hypothesis. There is sufficient evidence at the ??=0.05 level of significance to reject the null hypothesis.

9.

  1. np0(1-p0)=37.1>10 a) classical approach:z0>-0.74>-z0.10=-1.28 Do not reject the null hypothesis.
  2. P-value approach: P-value=0.2296 > ?? = 0.10.Do not reject the null hypothesis.
  3. Do not reject the null hypothesis. There is not efficient evidence at the ??=0.10 level of significance to reject the null hypothesis.

11.

  1. np0(1-p0)=45>10 a) classical approach:z0=-1.49 is between -z0.025=-1.96 and z0.025=1.96 Do not reject the null hypothesis.
  2. P-value approach: P-value=0.1362 > ?? = 0.05. Do not reject the null hypothesis.
  3. Do not reject the null hypothesis. There is not efficient evidence at the ??=0.05 level of significance to reject the null hypothesis.

13.

About 27 in 100 samples will give a sample proportion as high or higher 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 dartpicking strategy resulted in a majorty of winners.

15.

  1. p=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.

  2. Skip

  3. P-value=0.0721

  4. If obtained 100 different samples of size 678 from the population of Cramer predictions and the true proportion of correct predictions was 0.5, we would expect about seven of the samples to result in sample proportion of correct predictions of 0.472 or less.

g)Because the p-value is greater than the level of significance, do not reject the null hypothesis. The sample data does not provide sufficient evidence to conclude that Cramer???s predictions are correct less than half the time. 17.

  1. Ho: p=0,019; H1:p>0.019 Classical approach:z0=0.65<z0.01=2.33

  2. Do not reject the null hypothesis. There is no sufficient evidence at the ??=0.01 level of significance to conclude that more than 1.9% of Lipitor users experience flulike symptoms as a side effect.

19.

  1. Ho: p=0,36; H1:p>0.36 Classical approach:z0=2.69>z0.05=1.645

  2. Reject the null hypothesis. There is sufficient evidence at the ??=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 United States.