6. In the past, the mean score of the seniors at South High on the American College Testing(ACT) college entrance examination has been 20. This year a special preparation course isoffered, and all 43 seniors planning to take the ACT test enroll in the course. The samplemean of 43 ACT scores is 21.1. The principal believes that the new course has improvedthe Students' ACT scores.(a) Assume that ACT scores are normally distributed with standard deviation o=6. Statethe critical region. Is the outcome x = 21.1 a good evidence that the population meanscore is greater than 20?(b) Find the type II error probability and power of the test if the true population meanis 22.5 (Hint: in this case H1: u=22.5)

Given: Sample size, n = 43 Population mean, = 20 Sample mean, = 21.1 Standard deviation, = 6

Answered: the critical region. Is the outcome x =…

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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the critical region. Is the outcome x = 21.1 a good evidence that the population mean score is greater than 20? %3D