Author Question: Referring to question 29, the probability of making a Type II error is _________. a. 0.7764 c. ... (Read 32 times)

vicotolentino · **on:** Jun 19, 2018

Referring to question 29, the probability of making a Type II error is _________.

a. 0.7764 c. 0.2236
b. 0.2400 d. 0.6459

Question 2

An English teacher has been teaching a sixth grade composition class for many years. He has the feeling that over the past several years, the writing ability of students has changed. A national test of proficiency in composition was administered 5 years ago. The resulting distribution of scores was normally shaped, had a mean of 85 and a standard deviation of 10.9 . In order to test his feeling, he gives his present class of 43 students the same proficiency test. The resulting mean is 80 and the standard deviation is 8.7 . Using the z test with = 0.052 tail, what is your conclusion?

a. reject H0; the present class appears deficient in composition writing
b. retain H0; the present class is not deficient in composition writing
c. accept H0; the present class is not deficient in composition writing
d. reject H0; the present class is not deficient in composition writing