In a study to investigate the effect of regular physical exercise on the reduction of high blood pressure in males aged 60-65, the researchers selected at random a sample of n, = 12 males suffering...

a) Determine the standard deviation of the reduction in Blood pressure for subjects with no exercise program.

b) Determine the standard deviation of the reduction in Blood pressure for subjects on a daily exercise program .

c) Determine the variance in the reduction in Blood pressure for subjects with noexercise program.

Choose the correct option

Extracted text: In a study to investigate the effect of regular physical exercise on the reduction of high blood pressure in males aged 60-65, the researchers selected at random a sample of n, = 12 males suffering from high blood pressure in the given age group and for a two-year period placed the subjects on a daily physical exercise program. A second sample of n, = 12 males suffering from high blood pressure in the given age group was selected and again for the two-year period this group of subjects were placed on a physical exercise program for which they were required to perform only once a week. Finally a third sample of n, =12 males suffering from high blood pressure in the given age group was selected. No exercise program was required for individuals in sample three. At the end of the two-year period the reduction in blood pressure was measured for each of the subjects in the study and is presented in the table on the next page. Table V.1: Reduction in Blood pressure for three groups of males aged 60-65 initially suffering from high blood pressure. Exercise Daily Weekly No 21.2 15.7 5.6 15.6 18.5 -5.7 4.5 29.0 -14.8 32.0 17.4 4.9 20.4 6.7 8.6 12.2 11.4 18.6 11.2 4.1 -7.9 30.9 23.5 15.2 10.4 15.1 -2.3 23.7 5.8 -8.9 22.8 25.7 -1.2 11.2 19.7 8.6 Er 216.1 192.6 20.7 Er? 4697.43 3786.64 1180.17


Extracted text: а) 8.56 b) 10.20 с) 11.41 d) 12.05 e) 12.55 f) 15.40 g) 24.90 h) 27.50 i) 73.26 j) 104.04