Mathematics, 11.04.2021 16:40 lizziefayx3498
An SRS of 450 high school seniors gained an average of x = 21 points in their second attempt at the SAT Mathematics
exam. Assume that the change in score has a Normal distribution with standard deviation o = 55.
You can find the critical values to three decimal places by using the last row in table C.
(a) Find a 90% confidence interval for the mean change in score u in the population of all high school seniors. (Enter
your answers rounded to two decimal places.)
Answers: 2
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