The mean coffee consumption of a population of nurses is 9 cups of coffee per week.  A group of 10 ICU nurses consume a mean of 13 cups of coffee per week, where the estimated standard error of the mean is 1.90.  What is the 95% confidence interval for this sample and should we retain or reject the null hypothesis (H0), applying an alpha level of 0.05?       9.28 to 16.72; retain H0     8.76 to 17.24; retain H0     8.70 to 17.30; retain H0     4.70 to 13.30; reject H0

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