Business Statistics
posted by me on .
A random sample of six CEOs reported how many times per year they play tennis. The data follows.
3 41 96 32 52 19
Assuming the number of games played is normally distributed and the population standard deviation σ = 10, a 95% confidence interval for μ is:

95% = mean ± 1.96 SEm
SEm = SD/√n 
28.5

10

28.5, 44.5

28.5,44.5

96

55

3 96