Sample size for mean and Proportion
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A consumer agency has retained an independent testing firm to
examine a television manufacturer's claim that its 25-inch console
model consumes just 110 watts of electricity. Based on a preliminary study, the population standard deviation has been estimated as 11.2 watts for these sets. In undertaking a larger
study, and using a simple random sample, how many sets
must be tested for the firm to be 95% confident that its sample
mean does not differ from the actual population mean by more
than 3.0 watts?
NOTE: Please use an Excel spreadsheet for response. Please do not just
provide the answers but show in complete detail how you arrived at the
answers, step-by-step, from the beginning to the end of the solution.
(9.62)
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Solution Summary
Step by step method for calculation of sample size for mean and population proportion.
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Sample Size: Estimating the Population Mean/Proportion
A consumer agency has retained an independent testing firm to examine a television manufacturer's claim that its 25-inch console model consumes just 110 watts of electricity. Based on a preliminary ...
Purchase this Solution
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