Homework Answers
Solution:
Sample mean = (689.1+699.2+707.8+729.8)/4 = 2825.9/ 4 = 706.475
Sample standard deviation = sqrt((689.1-706.475)^2+(699.2-706.475)^2+(707.8-706.475)^2+(729.8-706.475)^2)/3) = 17.33
99% confidence interval can be calculated as
Mean +/- talpha/2*sd/sqrt(n)
706.475 +/- 5.84*17.33/sqrt(4)
706.475 +/- 50.60
655.87 to 757.07
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