Question

21)____________     A washing machine manufacturer says that 85% of its washers last five years        

                                  before repairs are necessary. A random sample of 100 washers showed that 79 of

22)____________     them lasted five years before they needed repair. Test to see if there is a        

                                  difference between the manufacturer claim and the sample results. List the

23)____________     21) test statistic     22) p-value     23) Does this data indicate that the

                                  manufacturer’s claim is too high or too low? (yes or no)        

  

24)____________    An SAT prep course claims to improve the test scores of students. The

                                     table shows the scores for seven students the first two times they took                    

25)_____________     the verbal SAT. Before taking the SAT for the second time, each

                                     student took a course to try to improve his or her verbal SAT scores.  

                                     Test the claim at a = .05. List the a) null hypothesis b) average difference       

                                     between the scores        

         

Student	1	2	3	4	5	6	7
Score on First SAT	308	456	332	443	306	471	432
Score on Second SAT	421	524	400	421	348	589	391

26)______________   In a crash test at five miles per hour, the mean bumper repair cost for 14

                                    midsize cars was $547 with a standard deviation of $85. In a similar test               

                                    of 23 small cars, the mean bumper repair cost was $347 with a standard                      

27)______________ deviation of $185. At a = 0.05, can you conclude that the mean bumper

                                    repair cost is the same for midsize cars and small cars? List the

                                    26) p-value 27) accept or reject.

28)______________ Last year the average daily change in the Dow Jones Industrial Index was 7.3

                                    points. A random sample of 15 trading days this year showed the average

29)______________   change to be 5.6 points with standard deviation 10.2. Test the claim that the

                                    average change in the index is less this year than it was last year. 28) List the

30)______________   p-value     29) Have we proven that the change is significant? (yes or no)

                                     30) what type of error could be made with the type of conclusion drawn from

                                     the results of this study?

Answer 1