21.32 Coaching and SAT Scores. Coaching companies claim thattheir courses can raise the SAT scores of high school students. Ofcourse, students who retake the SAT without paying for coachinggenerally raise their scores, too. A random sample of studentswho took the SAT twice found 427 who were coached and 2733who were uncoached.20 Looking at their Math scores on the firstand second tries, we have these summary statistics:CoachedUncoachedn427x521Try 1S100T561Try 22733 505 101 527S10010140Gain58The summary statistics for Gain are based on the changes in thescores of the individual students. Let's first ask if students whoare coached increased their scores significantly.a. You could use the information on the Coached line tocarry out either a two-sample t test comparing Try 1 withTry 2 for coached students or a matched pairs t test usingGain. Which is the correct test? Why?b. Carry out the proper test. What do you conclude?c. Give a 99% confidence interval for the mean gain of allstudents who are coached.

Given,the data on coached and uncoached students.To,tell the test type,carry the hypothesis, and99%…

sign a. You could use the information on the Coached line to carry out either a two-sample t test comparing Try 1 with Try 2 for coached students or a matched pairs t test using Gain. Which is the correct test? Why? b. Carry out the proper test. What do you conclude? c. Give a 99% confidence interval for the mean gain of all students who are coached.

sign a. You could use the information on the Coached line to carry out either a two-sample t test comparing Try 1 with Try 2 for coached students or a matched pairs t test using Gain. Which is the correct test? Why? b. Carry out the proper test. What do you conclude? c. Give a 99% confidence interval for the mean gain of all students who are coached.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 3E

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