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Normal Distribution, Mean Difference, and Boxplot

Hello.

Could you show me how to solve the attached problem #1.
It's long, but it's still a basic statistics problem.

It asks four questions:
a) What is the sample distribution of "d"?

b) What assumptions made in a) are checked by the plots?

c) Calculate a 95% confidence interval for the difference, if 12 other points are collected.

d) Draw a boxplot

Thanks for any assistance you can give.

Attachments

Solution Summary

This solution is provided in 520 words in an attached .doc file. It uses rules of a normal distribution to find standard deviation, uses calculations to solve for confidence interval, and includes a boxplot to satisfy the question.

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