# Confidence Interval for Mean: M&M Candies

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2) Constructing a confidence interval for the mean.

M&M Candies Use the following data of the weight in grams of M&M plain candies. Assume the population is normally distributed. **Hint: copy and paste the data into excel. Then use excel to find the sample mean and sample standard deviation you will need to complete the formula for error.

A) Construct a 95% confidence interval estimate of the mean weight of red M&MÃ?¢â?¬â?¢s.

B) Construct a 95% confidence interval estimate of the mean weight of green M&MÃ?¢â?¬â?¢s.

C) Compare the results from parts (A) and (B) and interpret them. Does there appear to be a difference? Why or why not?

RED GREEN

0.751 0.925

0.841 0.914

0.856 0.881

0.799 0.865

0.966 0.865

0.859 1.015

0.857 0.876

0.942 0.809

0.873 0.865

0.809 0.848

0.89 0.94

0.878 0.833

0.905 0.845

0.852

0.778

0.814

0.791

0.81

0.881

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##### Solution Summary

The solution provides step by step method for the calculation of confidence interval for population mean. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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