EDMS 451 Study Guide - Midterm Guide: Null Hypothesis, Statistical Hypothesis Testing, Test Statistic

• School: University of Maryland
• Department: Measurement, Statistics, and Evaluation
• Course: EDMS 451
• Professor: Greg Hancock

Document Summary

Independent group design: individuals in one group are completely independent/unrelated to those in the other group. Random samples of males and females, randomly assigned treatment versus control groups. Dependent group design: individuals in one group have one to one connection with someone in the other group. Married couples, split into husband and wife groups. History: occurrences during the course of a study extraneous to the independent (treatment) variable. A marketing company wants to see if a new ad campaign helps increase sales of a particular clothing line. During the campaign a famous celebrity is photographed wearing those clothes. A researcher is conducting polls on the 2016 presidential election. During the sampling period, one of the candidates says something scandalous, and his polling suddenly decreases sharply. Maturation: biological and psychological processes that naturally occur within subjects during the course of a study. A pharmaceutical company is testing the ef cacy of a growth hormone on children with an apparent growth disorder.