Professor HoltPSYC 340: Statistics II
Chi-Square Class Activity
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The use of the polygraph for lie detection remains controversial. In a typical laboratory experiment to test the technique, half the subjects are told to commit a mock crime; the other half of the subjects remains “innocent.” The polygrapher, blind to each subject’s condition, must make a judgment of guilt or innocence based on a subject’s physiological responses to a series of questions.
Test the null hypothesis that the polygrapher’s judgments are unrelated to the subject’s guilt.
Fill in the sums, and add your calculated expected frequencies in (parentheses) next to its observed value in the contingency table
Please remember to use complete sentences
State the hypotheses
Select the statistical test and significance level
Describe the sample
Find region of rejection (degrees of freedom and chi-sq critical value)
Calculate the TS