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Optional Collaborative Classroom Activity

25 April, 2016 - 15:57
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Have your instructor record the number of meals each student in your class eats out in a week. Assume that the standard deviation is known to be 3 meals. Construct an approximate 95% confidence interval for the true mean number of meals students eat out each week.

  1. Calculate the sample mean.
  2. σ = 3 and n = the number of students surveyed.
  3. Construct the interval
\left ( \bar{x}-2\cdot \frac{\sigma }{\sqrt{n}},\bar{x}+2\cdot \frac{\sigma }{\sqrt{n}} \right )

We say we are approximately 95% confident that the true average number of meals that students eat out in a week is between _______ and_______.