Exam 13: Understanding Research Results: Statistical-Inference Basics

Fred has concluded that there is no difference in driving ability between drivers who have consumed 1 versus 3 cans of beer.However,there really is a difference in ability between the drivers.Fred has made a(n)_____ error.

In a multiple-choice question with four alternatives,if the null hypothesis is correct,the probability of a person choosing the correct answer is approximately

When comparing two group means,the _____ refers to the number of scores free to vary once the means are known.

In testing differences between means,the _____ hypothesis would suggest the population means are different.

A consumer analyst asks participants to rate the comfort of the ride for two brands of all-terrain tires: Trail Cushion and Mud Handler.Trail Cushion was rated more comfortable with a mean of 5.5 than Mud Handler with a mean of 4.3.The Type II error would be to conclude that Trail Cushion was

A researcher is interested in studying whether responses to lowering the legal age for drinking alcohol (for or against)varies by gender (male or female).Which statistical test would be most appropriate for this type of data?