For a particular year, the average ACT score for graduating seniors was 28. A guidance counselor is interested in knowing whether a new prep technique increases ACT scores for graduating seniors. She takes a random sample of 33 students and finds their mean on the ACT after the prep course to be 28.9 with an estimated standard deviation of 2.3. Test the null hypothesis at the .01 level of significance.

For a particular year, the average ACT score for graduating seniors was 28. A guidance counselor is interested in knowing whether a new prep technique increases ACT scores for graduating seniors. She takes a random sample of 33 students and finds their mean on the ACT after the prep course to be 28.9 with an estimated standard deviation of 2.3. Test the null hypothesis at the .01 level of significance.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

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