A university assigns 35 sections of statistics courses with a support course for the current semester. The university wants to determine the average grade of all statistics courses with a support course model in order to continue offering courses with the support course model the next term. The 35 sections had an average grade of 78% with a standard deviation of 15%. The grade distributions of statistics courses with a support course model is normally distributed. Calculate a 95% confidence interval for the average grade of statistics courses with support course model. (73.03, 82.97) (72.85, 83.15) (77.84, 78.16) The sample size is too small to calculate a confidence interval.

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