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When you see 90 +/- 10, what does that mean in statistics? We have looked at margin of error being 1.96 x (Std Dev)/Sqrt(N). You

When you see 90 +/- 10, what does that mean in statistics?

We have looked at margin of error being 1.96 x (Std Dev)/Sqrt(N). You must remember how to calculate Std Dev. If you recalled the function in the spreadsheet, it would be fairly straight forward.

What do we mean by confidence interval? What is a normal distribution of data?

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