Dr. Goldstein studied the sleep patterns of five groups of subjects aged 10, 15, 20, 25, and 30 to determine if there were any differences in pattern following adolescence. How would this type of study be classified?

The external validity of an experiment means that:

Based on the Breusch-Pagan (BP) test for the ordinary least square (OLS) model, the null hypothesis is 1_____________(accepted / rejected). Accordingly, there is 2______________(heterogeneity/homogeneity) in error variance.

  Which design is presented below? Group 1: Pre-test – Treatment – Post-test Group 2: Pre-test – No Treatment – Post-test  

Let’s assume two sample linear regression as follows:

This section of the study explains how the results compare to expectations and to past research; explains the practical application; the strengths and weakness of study; and what should future research focus on:

Quasi-Experimental Research: 

What is one suggested limitation of the single subject design?

In what situation would the researcher be adjacent to the environment, but NOT actively involved in the process being studied?

Which of the following would be most likely to produce selection bias in a survey?