MGEB11H3 Chapter Notes - Chapter 10.1-10.4: Sample Size Determination, Statistical Hypothesis Testing, Simple Random Sample
13 Mar 2016
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10. 1 inferences about the diference between 2 populaion means: Inferences about diferences between mean: 1 - 2. Independent simple random samples = 2 samples taken separately and independently (assumed 1, 2 known) Select simple random sample of n1 units from pop"n 1. Select simple random sample of n2 units from pop"n 2. Ex: greystone department store has 2 stores in ny. Noiced that products that sell well in 1 store do not always sell well in the other (perhaps atributable to demographics). 1 = mean of pop"n 1 (mean age of customers at inner city) 2 = mean of pop"n 2 (mean age of customers at suburban) Compute sample mean xx 1 for sample n1. Compute sample mean xx 2 for sample n2. Compute pt. esimator: xx1 - xx2 (of 1 - 2) (dif b/w 2 pop"n mean dif b/w 2 sample mean: compute xx1 - xx2 + za/2 ( 1.
