Coaching companies claim that their courses can raise the SAT scores of high school students. Of course, students who retake the SAT without paying for coaching generally raise their scores. A random sample of students who took the SAT twice found 427 who were coached and 2733 who were uncoached. Starting with their verbal scores on he first and second tries, we have these summary statistics: Gain Try 1 Try 2 nissxS Coached 427 500 92 529 97 2959 Uncoached 2733 506 101 527 101 21 52 Construct, using the conservative estimate for degrees of freedom, a 98% confidence interval for the difference, -, between the mean gain of all students who are coached and the mean gain of all students who are uncoached. to

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Coaching companies claim that their courses can raise the SAT scores of high school students. Of course, students who retake the SAT without
paying for coaching generally raise their scores. A random sample of students who took the SAT twice found 427 who were coached and 2733 who were
uncoached. Starting with their verbal scores on he first and second tries, we have these summary statistics:
Gain
Try 1 Try 2
nissxS
Coached 427 500 92 529 97 2959
Uncoached 2733 506 101 527 101 21 52
Construct, using the conservative estimate for degrees of freedom, a 98% confidence interval for the difference, -, between the mean gain of all
students who are coached and the mean gain of all students who are uncoached.
to
Transcribed Image Text:Coaching companies claim that their courses can raise the SAT scores of high school students. Of course, students who retake the SAT without paying for coaching generally raise their scores. A random sample of students who took the SAT twice found 427 who were coached and 2733 who were uncoached. Starting with their verbal scores on he first and second tries, we have these summary statistics: Gain Try 1 Try 2 nissxS Coached 427 500 92 529 97 2959 Uncoached 2733 506 101 527 101 21 52 Construct, using the conservative estimate for degrees of freedom, a 98% confidence interval for the difference, -, between the mean gain of all students who are coached and the mean gain of all students who are uncoached. to
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