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 [you may find it useful to reference the t table.)
points
closing stock price
150
155
months
january
february
march
april
may
june
159
source: yahoo. com
a. calculate the sample mean and the sample standard deviation (round intermediate calculations to at least 4 decimal places and
"sample mean" and "sample standard deviation to 2 decimal places.)
sample mean
sample standard deviation
b. calculate the 95% confidence interval for the mean stock price of panera bread co., assuming that the stock price is normally
distributed (round "value to 3 decimal places and final answers to 2 decimal places.)
confidence interval