The lifetime of a certain type of battery is known to be normally distributed with standard deviation
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The lifetime of a certain type of battery is known to be normally distributed with standard deviation σ = 20 hours. A sample of 50 batteries had a mean lifetime of 120.1 hours. It is desired to construct a 95% confidence interval for the mean lifetime for this type of battery.
a. What is the point estimate?
b. Find the critical value.
c. Find the standard error.
d. Find the margin of error.
e. Construct the 95% confidence interval.
f. Is it likely that the population mean μ is greater than 130? Explain.
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