STATS 250 Study Guide - Midterm Guide: Confidence Interval

• School: U of M
• Department: Statistics
• Course: STATS 250
• Professor: Brenda Gunderson

Document Summary

One proportion key things: conditions: random and large( np and n(1 p) greater than or equal to 10, use p hat when finding confidence interval, this is used to find the theoretical distribution of all possible sample proportions of size n, parameter symbol: p, sample proportion: phat, when labeling graph for sample proportion distribution use n(mean, sd) see yellow formula card for formulas : z= phat p/ square root of p (1 p)/n the observed test statistic is a z score follows n(0,1) distribution : use this when it ask for distribution of zscores/pvalues!! 5 steps for conducting hypothesis test: determine null and alternative, check assumptions (np >10 n(1 p) > 10, random normal sample, find z formula from formula card, draw a graph of your z score and shade in where you want to find, find p value under the null, determine if significant, conclusion.