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Standard error of sample mean, 95% confidence interval

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A random sample of n = 9 men between 30 and 39 years old is asked to do as many situps as they can in one minute. The mean number is x bar = 26.2 and the standard deviation is s = 6.

a) find the value of the standard error of the sample mean.
b) find a 95% confidence interval for the population mean.

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The solution calculates value of the standard error of the sample mean and 95% confidence interval for the population mean.

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A random sample of n = 9 men between 30 and 39 years old is asked to do as many sit-ups as they can in one minute. The mean number is x bar = 26.2 and the standard deviation is s = 6.

a) find the value of the standard error of the sample mean.
b) find a 95% confidence interval for the population mean. ...

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