Chap 8 HWK

Chap 8 HWK - Math 200 Chap 8 homework Name 1 A sociologist...

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Math 200 Chap 8 homework Name: ____________________ 1. A sociologist would like to estimate the total amount of federal, state and city taxes paid by a family of four with income level \$50,000 per year. A random sample of 100 families produced sample mean x = \$4,258 with known standard deviation σ = \$1,098. Find a 95% confidence interval for the population mean. 2. Using a standard normal distribution table, find the critical value, , c z P ( - z 0.97 < z < z 0.97 ) = 0.97. 3. For σ = 1.1, n = 120, and z 0.95 = 1.96, find the maximal error tolerance, E . 4. A random sample of ten jumbo burgers from a local diner had the following weights (in ounces): 12.1 12.4 11.8 12.6 11.9 11.5 12.2 11.3 11.7 12.3 If μ is the mean weight of all jumbo burgers served at the diner, find a 99% confidence interval for μ .

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5. Given that P (–0.227 < x μ < 0.227) = 0.90 and n = 150, find σ . 6. The director of the city summer recreation program would like to estimate the proportion of children in the summer learn to swim program who do not know how to swim. A random sample

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This note was uploaded on 11/08/2010 for the course MA 200 taught by Professor Vyju during the Spring '10 term at Ivy Tech Community College.

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Chap 8 HWK - Math 200 Chap 8 homework Name 1 A sociologist...

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