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Hi
sample of 12 size AA batteries for toys
mean of 3.01 hours with standard deviation, 0.81 hours.
95% Confidence Interval
ME = 2.2(.81/sqrt(12)) = .51
CI: 3.01 - ME < u < 3.01 + ME
..........Small Sample Critical Value
DF Probability, p 2-tailed
0.1 0.05 0.01 0.001
1 6.31 12.71 63.66 636.62
2 2.92 4.3 9.93 31.6
3 2.35 3.18 5.84 12.92
4 2.13 2.78 4.6 8.61
5 2.02 2.57 4.03 6.87
6 1.94 2.45 3.71 5.96
7 1.89 2.37 3.5 5.41
8 1.86 2.31 3.36 5.04
9 1.83 2.26 3.25 4.78
10 1.81 2.23 3.17 4.59
11 1.8 
3.11 4.44
12 1.78 2.18 3.06 4.32
