# maths

A sample of 25users of a gym had their oxygen consumption measured for 30 minutes after arunning exercise.The sample mean and sample standard deviation of the oxygen consumption,in millilitres per kilogram of body weight per minute, were 24.1 and 18.7, respectively. Choose the option that gives an approximate 95% confidence interval for the mean oxygen consumption of gym users in the 30 minutes after the exercise,to two decimal places.
Options
A (16.77, 31.43) B (21.45, 26.75) C (21.28, 26.92) D (23.07, 25.13) E (19.72, 28.48) F (18.48, 29.72)

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asked by olek
1. It would help if you proofread your questions before you posted them, especially statistical data.

95% = mean ± 1.96 SD

This is assuming a normal distribution. However, with your data, Those below 1.5 SD (about 7%) would have no oxygen consumption. In other words, they would be dead.

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posted by PsyDAG

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