Choosing the Correct Statistical Test
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Last updated 4:25 AM on 3/30/26
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4 Terms
1
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Making an inference about the population proportion p
Large sample case
Use z test
Assumptions/Conditions:
* An independent random sample of size n is taken from the population
* The sample size is large enough that the distribution of p hat is approximately normal (must be at least 10 failures and successes)
2
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Given a percentile, confidence interval, or significance level, how do you find the z-score?
2nd —> distr —> 3: invNorm
3
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Difference in z-score for a one and two-tailed test:
One tailed: find Za
Two-tailed: find Za/2
4
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To use a two-tailed z-test for finding the true population proportion:
stat —> tests —> A:1-PropZint
