QMS 202 Lecture Notes - Lecture 7: Graphing Calculator, Test Statistic, Standard Deviation

• School: Ryerson University
• Department: Quantitative Methods
• Course: QMS 202
• Professor: Pauline Fu

Document Summary

You can use pooled variance sp2 = [(n1-1)s1. Note: i(cid:374) calculator keep (cid:862)pooled:o(cid:374)(cid:863: t1, t2 are unknown, and t1 does not equal t2. You can use the separate variance test. T = [[(x1 x2) (mean1 mean2)] / square- Chapter (cid:1005)(cid:1006). (cid:1007): (cid:862)paired-sample (t-test(cid:895)(cid:863) or also k(cid:374)ow(cid:374) as (cid:862)matched-sample (t-test(cid:895)(cid:863) or (cid:862)oepe(cid:374)da(cid:374)t a(cid:373)ples (cid:894)t-test(cid:895)(cid:863) Step 1: find the difference of each row, based on the data provided in the table. (difference = after before) Step 2: find the standard deviation of the differences. Step 4: make a conclusion by comparing test statistic. P = (x1 + x2) / (n1 + n2) Z = [(p1 p2) 1 (pie1 pie2)] / [square-root of [p(1-p)(1/n1 + 1/n2)]] Purpose: use this method when you need to find 3 or 4 population means. Step 1: find null and alternative hypotheses: h0: h1 = h2 = h3, h1: at least one meani is different from others.