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Author Question: College admissions administrators at a university are reevaluating their entrance requirements. They ... (Read 41 times)

joe3899

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College admissions administrators at a university are reevaluating their entrance requirements. They believe that the mean GPA for graduating high school seniors has increased dramatically over the last decade. They randomly sample 85 records of graduating seniors from 10 years ago (sample 1) and find an average GPA of 2.68. An independent random sample of 80 current graduating seniors yields an average GPA of 2.94. If the population variance of high school GPAs is 0.2601, find a 95% confidence interval for the difference in population mean GPA over the last decade.

(–0.42, –0.10)


(–0.29, –0.13)


(–0.36, –0.16)


(–0.46, –0.05)



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Marked as best answer by joe3899 on Feb 26, 2023

dude123

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joe3899

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Reply 2 on: Feb 26, 2023
YES! Correct, THANKS for helping me on my review


upturnedfurball

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

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