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Unformatted text preview: 3. The Hartnett Co. states that their widgets last for a 10 years period 94% of the time. a. For samples of size 175, what are the mean and standard deviation of the sampling distribution of sample proportion? (4 pts.) b. For a sample of size 175, what is the probability that the sample proportion of widgets lasting for a 10 year period is higher than 96%? c. For a sample of size 175, what is the probability that the sample proportion of widgets lasting for a 10 year period is higher than 85%?? (4 pts.) 4. The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that at least 175 homes are going to be used as investment property?. Test the claims using an α = 0.05 level of significance. (25 pts.) Assumptions Hypotheses Test Statistic Pvalue Conclusions...
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This note was uploaded on 06/16/2011 for the course STAT 201 taught by Professor Li during the Fall '07 term at South Carolina.
 Fall '07
 LI

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