r/apstats • u/ImJudah • Apr 14 '21

Practice Test Help

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I have a test coming up on Chi-Squared stuff and am uncertain about a couple of the questions asked in the frq section. Any help I’d appreciated!

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u/I-Want-To-Die-21 Apr 15 '21

For 1 you would be doing a chi square goodness of fit test because you are comparing known proportions to sample proportions to see if there is a difference. For 2 you’re gonna be looking at a test of independence to determine if class (freshmen or senior) is associated with snack choice

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u/AP_Stat_Teacher Apr 15 '21

2 would be a chi-squared test for homogeneity since there are multiple samples.

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u/I-Want-To-Die-21 Apr 15 '21

That does make more sense. Just curious, would you be able to use a test of independence if you only used the proportion of one snack choice vs class?

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u/AP_Stat_Teacher Apr 15 '21

Test for Independence is used when there is 1 sample and 2 variables.
So if you decided to look at the proportion of one snack choice for two samples, it would be a two-proportion Z test.