# HW9 - HW9(TTh ppl due Tu 11/27 MWF ppl due W 11/28...

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HW9 (TTh ppl – due Tu, 11/27, MWF ppl – due W, 11/28) Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .UMID . . . . . . . . . . . . . . . . . . . . . . . Lecture: MWF TTh GSI: Carrie Katherine Lin Lab Section # . Three “problem types”: 1) Setting up Ho & H 1 about p, providing the test statistic, its p-value, and conclusion, 2) calculating a CI on p and interpreting it, and 3) providing a necessary sample size to be 95% confident that your estimate will have a certain margin of error, e.g., +/- 3%. 1 – Suppose the AA News took a random sample of 300 residents and learned that 168 were opposed to the further development of condos in the downtown area. a. Define the population parameter p, i.e., let p = b. Given the AA News’ estimate is 56% (or 0.56), what is the 95% CI? Show your work with substitutions into the formula. 95% CI = ( . . . . . . . . . . , . . . . . . . . . . ) c. Does this CI indicate that the AA News can claim a majority of AA residents are opposed? Circle one: Yes No Please provide a brief rationale d. A 99% CI would be (circle one) wider narrower. e. The Detroit paper wants to replicate this survey. How large would the sample be to be 95%

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• Winter '08
• Veneable
• Statistics, Statistical hypothesis testing

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