Julia enjoys jogging. She has been jogging over a period of several years, during which time her physical condition has remained constantly good. Usually, she jogs 2 miles per day. The standard deviation of her times is ?=1.8σ=1.8 minutes. She has a random sample of 90 runs. For these 90 times, the sample mean was 15.61  minutes. Find an 98% confidence interval for the population mean time for Julie to run 2 miles.

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