The president of Doerman Distributors, Inc., believes that 26% of the firm's orders come from first-time customers. A simple random sample of 80 orders will be used to estimate the proportion of first-time customers.

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  • What is the probability that the sample proportion will be between .20 and .40 (to 4 decimals)?
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  • What is the probability that the sample proportion will be between .25 and .35 (to 4 decimals)?
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    • A simple random sample of five months of sales data provided the following information:

    http://west.instructor.cengagenow.com/ilrn/books/asmb03h/images/ch07/7.13.jpg

    1. Develop a point estimate of the population mean number of units sold per month.
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    2. Develop a point estimate of the population standard deviation (to 2 decimals).
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    The College Board American College Testing Program reported a population mean SAT score of

    http://west.instructor.cengagenow.com/ilrn/formulaImage?f=%5Cmu&ns=0
    = 1020 (The World Almanac 2003). Assume that the population standard deviation is
    http://west.instructor.cengagenow.com/ilrn/formulaImage?f=%5Csigma&ns=0
    = 100.

    1. What is the probability that a random sample of 75 students will provide a sample mean SAT score within 10 of the population mean (to 4 decimals)?
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    2. What is the probability a random sample of 75 students will provide a sample mean SAT score within 20 of the population mean (to 4 decimals)?
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      The president of Doerman Distributors, Inc., believes that 26% of the firm's orders come from first-time customers. A simple random sample of 80 orders will be used to estimate the proportion of first-time customers.
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