Question: Use the data in Exercise 5 to construct a 98% confidence interval for the mean lifetime for this type of battery. Exercise 5 The lifetime

Use the data in Exercise 5 to construct a 98% confidence interval for the mean lifetime for this type of battery.

Exercise 5

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.

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