The monthly closing stock prices (rounded to the nearest dollar) for Panera Bread Co. for the...
The monthly closing stock prices (rounded to the nearest dollar) for Panera Bread Co. for the first six months of 2010 are reported in the following table.
a. Calculate the sample mean and the sample standard deviation.
b. Calculate the 90% confidence interval for the mean stock price of Panera Bread Co., assuming that the stock price is normally distributed.
c. What happens to the margin of error if a higher confidence level is used for the interval estimate.
Months Closing Stock Price
| January | 145 | ||
| February | 144 | ||
| March | 149 | ||
| April | 146 | ||
| May | 150 | ||
| June |
140 |
||
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The monthly closing stock prices (rounded to the nearest dollar)
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