# Hypothesis Testing: Chi-Square Test of Independence A statistical hypothesis is

Hypothesis Testing: Chi-Square Test of Independence
A statistical hypothesis is a claim about a population parameter. Hypothesis testing is a way to build support for or against a population claim. There are many types of hypothesis tests. This week we will be using a Chi-Square Test of Independence to test the claim about the relationship between two categorical variables.
To prepare for this Discussion:
Review the Week 5 Discussion resources.
Search for two categorical variables.
Create a contingency table showing the results of your data collection.
Everyone will be testing to see if the two categorical variables are independent. You may have to search the internet or research your field of study (Psychology) for appropriate categorical variables. Stick to health-related topics. You cannot use rates, percentages or proportions in your contingency table. You must list counts.
Example:
A research report from the Working Group on Passive Smoking concluded that a link exists between passive smoking and prevalence of disease.
Null hypothesis: Exposure to passive smoke and prevalence of disease is
independent.
Alternative hypothesis: Exposure to passive smoke and prevalence of disease is
dependent.
Significance Level = .05
Heart Disease
Cancer
Diabetes
Significant Exposure to Passive Smoke
185
145
95
No Exposure to Passive Smoke
56
63
44
Degrees of freedom: 2
Test Statistic, X^2: 4.1767
Critical X^2: 5.991471
P-Value: 0.1239
Post a 1- to 2-paragraph write-up that includes the following:
Include your contingency table and describe the scenario you will be using for the hypothesis test. Give the null and alternative hypotheses and your level of significance.
Enter the data for your qualitative variables into the Statdisk Sample Editor.
List the results of the hypothesis test.
Write a conclusion statement based on your comparison of the p-value and level of
significance. Your conclusion to accept or reject is always directed to the null
hypothesis.

Hypothesis Testing: Chi-Square Test of Independence A statistical hypothesis is
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