7. We want to determine the effect of steroid use on UM baseball players. 10 ran

Question

7. We want to determine the effect of steroid use on UM baseball players. 10 randomly selected UM baseball players participate in our study. Each baseball player takes a strength test under two conditions: having consumed no steroids and having consumed steroids. Higher scores on the strength test indicate increased strength. Use the sign test to answer Questions 1-6 below. Steroids 50 No Steroids 30 45 35 60 25 30 40 20 65 60 40 35 45 35 70 11. Compare this value to the critical alpha level, = .05, and state your conclusion. Draw distribution with zone of null rejection. (40 pts)

Explanation / Answer

H0: mu1 = mu2

Ha: mu1 not equal to mu2

Group  Group One    Group Two  

Mean 49.50 41.00

SD 10.92 15.95

SEM 3.45 5.04

N 10 10

The mean of Group One minus Group Two equals 8.50
  95% confidence interval of this difference: From -4.34 to 21.34


  t = 1.3906
  df = 18
  standard error of difference = 6.112

Since p = 0.1813 is greater than 0.05 we accept that two means are equal.

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