Text: 10.21 Refer to Exercise 10.7. Calculate the probability of a Type II error when the actual proportion is .20.
Question 10.7 is to be used to solve question 10.21.
In some states, the law requires drivers to turn on their headlights when driving in the rain. A highway patrol officer believes that less than one-quarter of all drivers follow this rule. As a test, he randomly samples 200 cars driving in the rain and counts the number whose headlights are turned on. He finds this number to be 41. Does the officer have enough evidence at the 10% significance level to support his belief?