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A sample of 11 children in the 5th grade of North Stratfield School run the 100...

A sample of 11 children in the 5th grade of North Stratfield School run the 100 meter dash in a average time of 24 seconds. Assume the bias adjusted sample standard deviation of the individual 100 meter dash times is 7.2 seconds. Construct a 95% confidence interval for μ , the true population mean 100 meter dash time. Since n is small, the t statistic will be used in deriving this confidence interval. What is the degrees of freedom parameter that should be used to derive the t-value? What is the confidence interval? Give your answers as decimals, to two places   < μ <

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Answer #1

So 95% confidence interval for mean is

( 19.16 sec < < 28.84 sec )

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