 Chi-Square Test of Independence

# Chi squared hypothesis test, answer to problem on pancreaticoduodenectomy and surgical apgar scores

## State the Hypotheses

A University conducted a survey of its recent graduates to collect demographic and health information for future planning purposes as well as to assess students' satisfaction with their undergraduate experiences. How to calculate the chi-square statistic by hand. The alternative hypothesis is that knowing the level of Variable A can help you predict the level of Variable B. The technique to analyze a discrete outcome uses what is called a chi-square test. The program included modules on exercise, nutrition and smoking cessation. Using the appropriate degrees of 'freedom, locate the value closest to your calculated chi-square in the table.

## When to Use Chi-Square Test for Independence

To ensure that the sample size is appropriate for the use of the test statistic above, we need to ensure that the following: This is done by multiplying the observed sample size n by the proportions specified in the null hypothesis p 10p Chi squared hypothesis testFor example, in some clinical trials the outcome is a classification such as hypertensive, pre-hypertensive or normotensive.

Refer to a chi-square distribution table Table B. You are asked to propose the genotypes of the parents. Formulate an Analysis Plan The analysis plan describes how to use sample data to accept or reject the null hypothesis. Interpret Results If the sample findings are unlikely, given the null hypothesis, the researcher rejects the null hypothesis.

Calculate 2 using the formula. In our example, there are two categories green and yellow ; therefore, there is I degree of freedom. The sampling method is simple random sampling.

Boston University School of Public Health Introduction This module will continue the discussion of hypothesis testing, where a specific statement or hypothesis is generated about a population parameter, and sample statistics are used to assess the likelihood that the hypothesis is true.

The degrees of freedom DF is equal to: Use the chi-square test for independence to determine whether there is a significant relationship between two categorical variables.

Determine a relative standard to serve as the basis for accepting or rejecting the hypothesis.