A study of 36 marathon runners showed that they could run at an average rate of 7.8 miles per hour. The sample standard deviation is 0.6. Find a point estimate of the population mean. Find the 90% confidence interval forthe mean of all runners. Based on the results, what minimum speed should a runner obtain to qualify to run in a marathon? answer

asked by Anonymous

11 years ago

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1 answer

Z = (score-mean)/SEm

SEm = SD/√n

90% = mean ± 1.645 SEm

What is your cutoff point to run?

answered by PsyDAG

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Question

A study of 36 marathon runners showed that they could run at an average rate of 7.8 miles per hour. The sample standard deviation is 0.6. Find a point estimate of the population mean. Find the 90% confidence interval forthe mean of all runners. Based on the results, what minimum speed should a runner obtain to qualify to run in a marathon? answer

1 answer

Z = (score-mean)/SEm

SEm = SD/√n

90% = mean ± 1.645 SEm

What is your cutoff point to run?

PsyDAG · Answer

Z = (score-mean)/SEm SEm = SD/√n 90% = mean ± 1.645 SEm What is your cutoff point to run?