Project #16474 - Biostats

MATH 577                    

 

 

 

1.      Using a = 0.05, test if the mean weight change is less than 0 if a sample of size 36 people on the Atkins diet yielded a mean change of -2.1 with a std deviation (s) of 4.8.

 

 

 

2.      Test the claim that the life span of PC’s is 7 years using a = 0.05.  Assume a sample of 25 yielded a mean of 6.8 with a sample standard deviation of 2.4.

 

 

 

3.      Using a = 0.05, test whether the population proportion of college graduates who smoke is not the 0.27 rate for the general population.   Assume in a sample of 800, 144 college graduates smoke.

 

 

 

4.Using a = 0.05, test if the population variance s2 is greater than 4.9 if a sample of size 24 yields a sample variance of 6.2.

 

 

 

5.      Using a a = 0.05, test for a difference in the means.

 

                        group                        n            mean                        population std dev

 

                           1                        200            7.3                        3.0

 

                        2            200      8.2            3.0

 

 

 

6.      Form a 95% confidence interval on the difference in the means.

 

                        group                        n            mean                        sample std dev

 

                           1                        10            4.9                        0.9

 

                       2            10      4.4            1.4

 

 

 

7.      Using the following output and a = 0.05,  test that the mean for group 1 is greater than the mean for group 2.     

 

            group                        n            mean                        sample std dev

 

              1                        10            4.5                        0.8

 

              2                        10            3.4                        0.8

 

     

 

8.       Form a 95% confidence interval on the difference in the means.

 

                        group                        n            mean                        population std dev

 

                           1                        250            95.5                        16

 

                        2            200      104.9            14

 

 

 

9.      Using a significance level of 0.05 to compare results of treatment for carpal tunnel syndrome, test that the proportion for surgery is greater than the proportion for splints.

 

    groupNumber of successessample size

 

surgery6773

 

splints6083

 

 

 

10.In a sample of 237 homes in Lagrange, 45 were found to have unsafe radon levels and of 186 homes in Hyde Park, 30 had unsafe radon levels. Form a 95% confidence interval on the difference in the proportions.

 

 

 

Subject Mathematics
Due By (Pacific Time) 11/14/2013 12:00 pm
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