# Homeboy

## Homeboy

AP Stats Mr. Honberger Name___________________
Review Ch. 9 and 10 Date_________Per________

1. Assume that a computer was used to generate the given confidence interval for the population mean, [pic]. Find the sample mean or margin of error as specified. (145, 157). Find the sample mean,[pic].

a) 151.0 b) 150.5 c) 145 d) 152.5

Assume that a hypothesis test of the given claim will be conducted. Identify the type I or type II error for the test.

2. Carter Motor Company claims that its new sedan, the Libra, will average better than 28 miles/gallon in the city. Identify the type I error for the test.

a) The error of rejecting the claim that the mean is at most 28 mpg when it really is at most 28 mpg.
b) The error of failing to reject the claim that the mean is at most 28 mpg when it is actually greater than 28 mpg.
c) The error of rejecting the claim that the true proportion is more than 28 mpg when it really is more than 28 mpg.

3. An Entomologist writes an article in a scientific journal which claims that fewer than 11 in ten thousand male fireflies are unable to produce light due to a genetic mutation. Identify the type I error for the test.

a) The error of rejecting the claim that the true proportion is at least 11 in ten thousand when it really is less than 11 in ten thousand.
b) The error of failing to reject the claim that the true proportion is at least 11 in ten thousand when it is actually less than 11 in ten thousand.
c) The error of rejecting the claim that the true proportion is at least 11 in ten thousand when it really is at least 11 in ten thousand.

4. A researcher claims that 62% of voters favor gun control. Identify the type II error for the test.

a) The error of rejecting the claim that the proportion favoring gun control is more than 62% when it really is more than 62%.
b) The error of failing to reject the claim that the proportion favoring gun control is 62% when it is...