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Stack #73081
| Question | Answer |
|---|---|
| test for one prop z test | phat-pnaught over the square root of pnaught times 1-pnaught over n |
| formula for one prop z interval | phat +/- the square root of phat times 1-phat over n |
| assumptiosn for onme prop test or interval (z) | 1) srs 2) pop size is at least 10 times as the sample size (st) npnaught adnd n(1-panught) must br greater than ten (cI) npat and n(1-phat) must be greater than ten |
| twoprop z interval | (phat1-phat2) +/- z* squareroot of phat1(1-phat1)/n1+phat2(1-phat2)/n2 |
| two prop z test | phat1-phat2/sq. root of p(1-p) times (1/n1+1/n2) |
| p=pooled sample prop= | numkber of success in both samples combined over total number fo observations in tbot samples |
| assumptions for a two sample two propertion z interval and two propertion z test | 1) 2 srs's 2) both propulation sizes > 10 times their sample sizes 3) (ci) n1phat1 n1(1-phat1)>5, n2p2>5, n2(1-phat2)> 5 (st) same thing only p not phat |
Created by:
lilee256