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old test - KEEP THREE DECIMAL PLACES ON ALL CALCULATIONS ON...

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1 Version 1 KEEP THREE DECIMAL PLACES ON ALL CALCULATIONS ON EVERY QUESTION QUESTIONS 1-4 : From a survey of 250 randomly selected coworkers, the company you work for finds that 155 would like the company to provide on-site day care. A 95% confidence interval was calculated from this sample and found to be (0.56, 0.68). 1. What does 62% represent? a. Population parameter b. Sample statistic c. Margin of error d. probability of an individual worker wanting on-site day care e. Probability of 95% of the workers wanting on-site day care 2. What is the standard error of the sample proportion, ? a. 0.12 b. 0.09 c. 155 d. 0.06 e. 0.03 3. Interpret the interval given above. a. 95% of the time, the percentage of coworkers who would like the company to provide on-site day care is 62%. b. 95% of random samples will show that 56% to 68% of coworkers who would like the company to provide on-site day care. c. The company is 95% confident their sample statistic falls between 56% and 68%. d. 95% of the time, between 56% and 68% of coworkers who would like the company to provide on-site day care. e. The company is 95% confident the proportion of coworkers who would like the company to provide on-site day care is between 56% and 68%. 4. Suppose you increase the level of confidence, keeping everything else constant. What would change? a. The margin of error would decrease. b. The margin of error would increase. c. The sample size would increase. d. There would be a higher probability of capturing the sample statistic. e. There would be a lower probability that the (second) interval captured the true proportion of coworkers who would like the company to provide on-site day care ______________________________________________________________________________ ˆ p
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2 Version 1 5. Jake’s Hardware Store buys tiles from Tile Wholesale Warehouse. For quality assurance purposes, 500 ceramic tiles were randomly selected for inspection to determine the proportion of defective (e.g., cracked, uneven finish, etc.) tiles. If the true proportion of defective tiles is 0.07, what is the probability that 45 or more tiles in this sample will be defective? a. 0.9599 b. 0.0344 c. 0.0594 d. 0.9656 e. 0.8508 ______________________________________________________________________________ QUESTIONS 6-8 : Direct mail advertisers send solicitations (“junk mail”) to thousands of potential customers in the hope that some will buy the company’s product. The response rate is usually quite low. Suppose a company wants to test the response to a new flyer and sends it to 1000 people randomly selected from their mailing list of over 200,000 people. They get orders from 123 of the recipients. 6. Calculate a 90% confidence interval for the true proportion of people who placed orders after receiving the new type of flyer. a.
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This note was uploaded on 01/10/2012 for the course MIST 3000 taught by Professor Kim during the Fall '11 term at UGA.

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old test - KEEP THREE DECIMAL PLACES ON ALL CALCULATIONS ON...

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