chi-square gof prn

# chi-square gof prn - Chi-square Goodness-of-Fit Test This...

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Chi-square Goodness-of-Fit Test This Chi-square test is a nonparametric NHST for testing hypotheses about the form of the entire population distribution. On the other hand, the t- test and the F-test for testing the equal variances are example of parametric tests based on ratio or interval scales of measurement. (e.g.) An opinion poll taken in 1970 revealed the following data regarding the legalization of marijuana: 15% in favor of, 79% against, and 6 % no opinion. Suppose a random sample of n = 220 people in 1990 shows the following data: 52 (23.7%) -- in favor of 151 (68.6%) -- against 17 (7.7) -- no opinion Does the above data indicate a significant change in opinion about the legalization of marijuana? Or, is there a significant difference between

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the 1990 and the 1970 data? Note that (1) Data type: frequency data (i.e., always counting data , not numerical scores or amount or size); and (2) Hypothesis: no mention about any parameter value. Chi-square Test The chi-square statistic measures how well the observed frequency distribution fits the population distribution, i.e., "
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## This note was uploaded on 07/17/2008 for the course PSYCH 826&N taught by Professor Myung during the Fall '04 term at Ohio State.

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chi-square gof prn - Chi-square Goodness-of-Fit Test This...

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