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

 

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