You want to estimate the mean weight of quarters in circulation. A sample of 40 quarters...

You want to estimate the mean weight of quarters in circulation. A sample of 40 quarters has a mean weight of 5.678 grams and a standard deviation of 0.063 gram. Use a single value to estimate the mean weight of all quarters. Also, find the 95% confidence interval for the average weight of all quarters

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Expert Solution

We have given that,

Sample mean =5.678 grams
Sample standard deviation = 0.063 grams
Sample size =40
Level of significance=1-0.95=0.05
Degree of freedom =39

t critical value is (by using t table)=   2.023

Confidence interval formula is

=(5.6578,5.6982)


Lower confidence limit=5.658 grams

Upper confidence limit=   5.698 grams

orchestra answered 1 year ago

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