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hypothesis testing (1).docx

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Department
Statistics
Course
STATS 2B03
Professor
Aaron Childs
Semester
Fall

Description
October 9 , 2012 Stats 2B03: Statistical Methods for Science Hypothesis Testing (1) 6.5 Confidence Intervals for a Population Proportion - Example: 60 people write test 1 early, and 8 of them fail. Find a 98% CI for the failure rate of the class α = .02, ⁄ √ 031 to .236 i.e. between 3.1% and 23.6%  ± is margin of error  in this case the margin of error was 10% - too big of a margin of error 6.8 Determining the Sample Size for Estimating Proportions - example: suppose that we want to estimate the proportion of Canadians that are left handed accurate to within 3% with a 90% confidence interval. How large a sample should be used? ⁄√ when α=.10, *using the average between 1.64 and 1.65 ⁄ because Z .95s in between the two
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