In a study of cell phone usage and brain hemispheric dominance, an Internet survey was emailed to 6958 subjects randomly selected from an online group involved with ears. There were 1292 surveys returned. Use a 0.01 signicance level to test the claim that the return rate is less than 20%. Use the Pvalue method and use the normal distribution as an approximation to the binomial distribution. Identify the null hypothesis and alternative hypothesis. -:j :1 A. -lo: p0.2 H139\"-2 The test statistic is z = . (Round 0 two decimal places as needed.) The Pvalue is (Round 0 three decimal places as needed.) Because the P-value is V the significance level: V the null hypothesis. There is Y evidence to support the claim that the return rate is less than 20%. greater than reject insufcient less than fail to reject sufficient Trials in an experiment with a polygraph include 99 results that include 24 cases of wrong results and 75 cases of correct results. Use a 0.05 significance level to test the claim that such polygraph results are correct less than 80% ofthe time. Identify the null hypothesis, alternative hypothesis: test statistic, P-value: conclusion about the null hypothesis: and final conclusion that addresses the original claim. Use the P-value method. Use the normal distribution as an approximation of the binomial distribution. Let p be the population proportion of correct polygraph results. Identify the null and alternative hypotheses. Choose the correct answer below. {a A. H0: p=0.20 {.1 B. H0: p = 0.80 H1:p;60.20 H1:p.ri0.80 ['1 C. H01p=0.80 {.1 D. H01p = 0.20 H1:p0.80 H11p>0.20 "he test statistic is z = . (Round to two decimal places as needed.) "he Pvalue is .(Round .0 four decimal places as needed.) dentify the co1clusion about the null hypothesis and the final conclusion that addresses the original claim. Y HD. There Y sufficient evidence to support the claim that the polygraph results are correct less than 80% of the time. Reject is not Fail to reject is In a study of 420,132 cell phone users: 148 subjects developed cancer ofthe brain or nervous system. Test the claim of a somewhat common belief that such cancers are affected by cell phone use. That is: test the claim that cell phone users develop cancer ofthe brain or nervous system at a rate that is different from the rate of 0.034092: for people who do not use cell phones. Because this issue has such great importance, use a 0.001 significance level. Identify the null hypothesis, alternative hypothesis, test statistic, P-value: conclusion about the null hypothesis: and final conclusion that addresses the original claim. Use the P-value method and the normal distribution as an approximation to the binomial distribution. Which of the following is the hypothesis test to be conducted? -.;j'l A. H0: p = 0.00034 ali'l B. Hg: 0 0.00034 H1: 0 = 0.00034 -.;j'l c. H0: p = 0.00034 ali'l D. H0: 0 = 0.00034 H1: 04000034 H1: p