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Confidence interval

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The batteries used in a digital watch have a operating life that is normally distributed. A sample of 16 batteries reveals a mean of 3.45 years and a standard deviation of 0.3 years. For 15 df, the area in the right tail of the t distribution is 0.10 if t = 1.341, 0.05 if t = 1.753, and 0.025 if t = 2.131. The width of a 95% confidence interval is

a. 0.16 years
b. 0.20 years
c. 0.26 years
d. 0.32 years

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Solution Summary

The solution gives the step by method for the construction of the confidence interval for population mean.

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95% confidence interval
The batteries used in a digital watch have a operating life that is normally distributed. A sample of 16 batteries reveals a mean of 3.45 years and a standard deviation of 0.3 years. For 15 df, the area in the right ...

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