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2. A random sample of 25 male runners has a mean of ¯ x = 60...

2. A random sample of 25 male runners has a mean of ¯ x = 60 and standard deviation s = 3 kilograms (kg). Suppose that the mean weights of male runners follow a normal distribution with unknown mean µ and unknown standard deviation σ kg. Find a 90% confidence interval for µ. (10 pts.)

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Answer #1

Confidence interval calculation.

Here 90% confidence that population mean of weights  lies between 59 to 61 kg

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