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1) A random sample of 100 batteries has a mean lifetime of 15 hours. Suppose the standard deviation for battery life in the population of

1) A random sample of 100 batteries has a mean lifetime of 15 hours.

Suppose the standard deviation for battery life in the population of all batteries is 2 hours.

Give a 95% confidence interval for the mean battery life .

2) Now compute a 90% confidence interval for the mean weight of the Valencia oranges based on our previous sample of size 25.

(n = 25, x = 10,0 = 2)

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