Construct a 95% confidence interval for the population mean, μ. assume the population has a normal distribution. a random sample of 16 lithium batteries has a mean life of 645 hours with a standard deviation of 31 hours

Step-by-step explanation:

Given : Sample size : , which is a small sample (, 30) so we use t-test.

Sample mean :

Standard deviation :

Significance level :

Critical value :

The confidence interval for population mean is given by :-

Hence, a 95% confidence interval for the population mean =

answer: a

step-by-step explanation:

10.2 units

-14 is the answer

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