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  • 00:04

    HERSCHEL KNAPP: Welcome to Introductory Statistics UsingSPSS, second edition.This video shows how to process the Chi-Square test.You can watch the entire video or use the time sliderto navigate directly to any time point.

  • 00:25

    HERSCHEL KNAPP [continued]: Chi-square assesses the associationbetween categorical variables.This example involves two categorical variables, genderand ice cream flavor preference.Gender contains two categories, girl and boy.And ice cream contains three categories-- chocolate,

  • 00:45

    HERSCHEL KNAPP [continued]: strawberry and vanilla.The Chi-Square will tell us if there'sa statistically significant correlation between genderand ice cream flavor preference.If the Chi-Square renders a statistically significantfinding, this would indicate that girlshave different ice cream flavor preferences from boys.

  • 01:06

    HERSCHEL KNAPP [continued]: The other possibility is that the Chi-Square producesa statistically insignificant finding, whichwould suggest that there are no significant differencesbetween the groups.In other words, girls and boys have approximately the same icecream flavor preferences.

  • 01:26

    HERSCHEL KNAPP [continued]: To satisfy the pretest checklist for Chi-Square,there should be at least five items per cell.We'll be able to verify the cell counts when werun the actual Chi-Square test.This example uses the data set Ch 09- example 01-

  • 01:47

    HERSCHEL KNAPP [continued]: Chi-Square.sav.This data set contains two categorical variables--gender and ice cream flavor preference.To run the Chi-Square test, click on Analyze,Descriptive Statistics, cross tabs.

  • 02:08

    HERSCHEL KNAPP [continued]: Move gender to rows and ice cream to columns.Click on Statistics, select Chi-Square, and click Continue.Next, click on Cells.We'll be using the default observed,which will render the actual counts in each cell.

  • 02:30

    HERSCHEL KNAPP [continued]: You can also order the data in each cellto be presented in percentages.In this example, for simplicity, we'll select observed only.Click Continue.Select display clustered bar charts.Click OK, and it'll process.

  • 02:53

    HERSCHEL KNAPP [continued]: As we examine the table, we can seethat there are at least five elements per cell.This satisfies the pre-test criteria.This table suggests that, proportionally, girlsprefer different ice cream flavors than boys.The real answer lies in the Chi-Square test table.Here we see a p-value of 0.001.

  • 03:16

    HERSCHEL KNAPP [continued]: Since this is less than 0.05, thissuggests that there is a statistically significantdifference between girls and boyswhen it comes to ice cream flavor preferences.These findings are reflected in the corresponding bar chart.This concludes this video.

Video Info

Series Name: Introductory Statistics Using SPSS

Episode: 12

Publisher: SAGE Publications, Inc.

Publication Year: 2017

Video Type:Tutorial

Methods: Chi-square test, SPSS

Keywords: ice cream; mathematical computing; mathematical concepts; Software

Segment Info

Segment Num.: 1

Persons Discussed:

Events Discussed:

Keywords:

Abstract

Professor Herschel Knapp demonstrates a Chi-square Test by combining SPSS with ice cream. He guides users through the setup screens of the software and offers an example of categorical variable relations using the SPSS reporting tools and histograms.

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Chi-Square

Professor Herschel Knapp demonstrates a Chi-square Test by combining SPSS with ice cream. He guides users through the setup screens of the software and offers an example of categorical variable relations using the SPSS reporting tools and histograms.