WEEK 2

Introduction to Hypothesis Testing Table

PSYCH/625 Version 5

1

Research Scenario

One-tail or two-tail test

Justification

A local dermatologist claims that 30% of mole biopsies are unnecessary. Last month at his clinic, 210 out of 634 had benign biopsy results. Is there enough evidence to reject the dermatologist’s claim?

BONITA

BONITA

A local dermatologist claims that more than 30% of mole biopsies are unnecessary. Last month at his clinic, 210 out of 634 had benign biopsy results. Is there enough evidence to reject the dermatologist’s claim?

DONETTE

DONETTE

A local dermatologist claims that less than 30% of mole biopsies are unnecessary. Last month at his clinic, 210 out of 634 had benign biopsy results. Is there enough evidence to reject the dermatologist’s claim?

SHONDA

SHONDA

Research Scenario

Null hypothesis:

Alternative hypothesis:

A pharmaceutical company believes their weight loss drug is more effective than any program on the market. They study two groups of people: Group A is given the drug and Group B is given a placebo. They then compare weight loss over the course of 3 months.

FELICIA

FELICIA

A college professor believes class attendance is different on sunny versus cloudy days.

Class attendance is the same on sunny days and cloudy days.

Class attendance is higher on sunny days than it is on cloudy days.

Researchers hypothesize that rats fed donuts for breakfast will perform worse on a task than those fed a high-protein breakfast.

There is no difference in task performance based on a rat’s meal.

Rats that are fed a high-protein breakfast will perform better on tasks than rats who were fed donuts.