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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.
- Calculate the sample mean.
- σ = 3 and n = the number of students surveyed.
- Construct the interval
![\left ( \bar{x}-2\cdot \frac{\sigma }{\sqrt{n}},\bar{x}+2\cdot \frac{\sigma }{\sqrt{n}} \right )](/system/files/resource/9/9418/9468/media/eqn-img_3.gif)
We say we are approximately 95% confident that the true average number of meals that students eat out in a week is between _______ and_______.
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