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October 4 and 6 guide
Terms in this set (15)
For difference in population proportions, we use ____ instead of mu.
p (or pi)
For the difference in proportions, what is the equivalent of X bar?
What are the assumptions we make for testing a hypothesis in difference of proportions?
- independent observations
- large enough sample sizes
review calculations for test statistic of proprotions
review calculations for CI of proportions
When determining whether or not to reject the null for difference in proportions (and in difference in means), what value do you check to see in the CI?
0, because that is the null.
What test is the alternative to a z test? (Allows more flexibility)
Pearson chi square test
The probability of two events (given that they are independent) happening together is equal to the _________
product of their individual probabilities
Instead of using the chi square formula, what is a short cut to calculating chi square?
square your z statistic
what value of risk ratio suggests no significant difference?
what value of odds ratio suggests no difference?
what value for the absolute risk reduction/increase suggests no difference?
What test do we use when the large enough sample size assumption is violated?
Fisher's exact test
Which test is used for dependent observations when comparing two proportions?
McNemar test is used when comparing 2 proportions. Which test is used when comparing more than 2?
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