Coaching companies claim that their courses can raise the SAT scores of high school students. But students who retake the SAT without payingfor coaching also usually raise their scores. A random sample of students who took the SAT twice found 427 who were coached and 2733 who wereuncoached. Starting with their verbal scores on the first and second tries, we have these summary statietics:Try 1 Try 2 GainCoached 427 500 92 520 07 2959Uncoached 2733 s06101 527 10121 62Give a 99.5% confidence interval for the mean gain of all students who are coached. PHint: Use the "Gain" columns and do a 1-sampie confidenceinterval).toat 99.5% confidence.Now test the hypothesis that the score gain for coached students is greater than the score gain for uncoached students. Let be the score gain for aCoached students. Let a be the score gain for uncoached students(A) Give the alternative hypothesis: Hi -0.(b) Give the test statistic(c) Give the P-value: PaThe conclusion isA. There is not sufficient evidence to support the claim that with coaching, the mean increase in scores is greater than without coachingB. There is sufficient evidence to support the claim that with coaching, the mean increase in scores is greater than without coaching

Given data: Gain x¯ s n Coached 29 59 427 Uncoached 21 52 2733

Answered: for coaching also usually raise their…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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