urses webwork / math170fall22johnson / chapter_8 / 14 mework Sets Chapter 8 Problem 14 Chapter 8: Problem 14 er Settings Previous Problem ades Problem List Next Problem Problems (1 point) A recent poll of 2200 randomly selected 18-25-year-oids revealed that 255 currently use marijuana or hashish. According to a publication, 12.8 % of 18-25-year-olds were current users of marijuana or hashish in 1997. Do the data provide sufficient evidence to conclude that the percentage of 18-25-year-oids who currently use marijuana or hashish has changed from the 1997 percentage of 12.8%? Use a = 0.05 significance level. test statistic z = roblem 1 v roblem 2 v Recall the z value that marks the start of the rejection region is the critical z score, if you're lower tailed, it's the z value that has left area of a; if you're right taked, it's the z value whose area roblem 3 / to the right is c; if you're two-tailed, they're the values of the 1:z value that -z has left area of " and z has a right are of " .. note the divided by 2 part!! roblem 4 V positive critical z score roblem 5 / roblem 6 / negative critical z score roblem 7 roblem 8 v The final conclusion is roblem 9 roblem 10 / O A. There is sufficient evidence to conclude that the percentage of 18-25-year-oids who currently use marijuana or hashish has changed from the 1997 percentage of 12.816 . B. There is not sufficient evidence to conclude that the percentage of 18-25-year-olds who currently use marijuana or hashish has changed from the 1997 percentage of 12.87% roblem 11 ... roblem 12 ... roblem 13 ... Note: You can earn partial credit on this problem. oblem 14 Preview My Answers Submit Answers roblem 15 ... roblem 16 V You have attempted this problem 2 times. oblem 17 V Your overall recorded score is 25%. remaining (Sirkirk Damis) Nov 28 10:31 7User Settings Previous Problem Problem List Next Problem Grades Problems (1 point) A random sample of 110 observations is selected from a binomial population with unknown probability of success p. The computed value of p t 0.71 (1) Test Ho : p = 0.6 against H. : p > 0.6. Use a = 0.05. test statistic z = 5.06 Problem 1 critical z score Problem 2 The final conclusion is Problem 3 / Problem 4 A. There is not sufficient evidence to reject the nul hypothesis that p = 0.6. Problem 5 B. We can reject the null hypothesis that p = 0.6 and accept that p > 0.6. Problem 6 / Problem 7 / (2) Test Ho : p = 0.55 against H. : p