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The following data give the 2020 profits (in millions of dollars) of the 11 Arizona-based companies for the year 2020. Assuming that the ages of

The following data give the 2020 profits (in millions of dollars) of the 11 Arizona-based

companies for the year 2020. Assuming that the ages of all companies have a normal

distribution.

312 357 421 289 193 374 497 112 1020 425 526

Construct a 95% confidence interval for the average profits of all companies and make a

comment on the result.

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