Study Questions

Short Answer

1. How does a t distribution differ from a z-score distribution?
Ans: The t distribution has more scores at the extremes compared to the normal curve; however, as the degrees of freedom increase, the t distribution will start to look like a normal curve.
Learning Objective: 9-1: How does the distribution of t scores differ from the distribution of z scores?
Cognitive Domain: Comprehension
Answer Location: The t Distribution

2. What is the difference between the formula for standard error and the estimated standard error?
Ans: When calculating standard error, you would use population standard deviation, whereas for estimated standard error, you would use sample standard deviation.
Learning Objective: 9-3: How do standard error and estimated standard error differ?
Cognitive Domain: Knowledge
Answer Location: The t Distribution