Chapter 12 Solutions

Part c f by employing the guess for in part

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Unformatted text preview: is: ̂( ̂) ⁄ ( ) Thus the required sample size is n = 2305. part c. ( )⁄ √ √ ( )⁄ f. By employing the guess for ̂ in part d we can reduce the required sample size by 96(from 2401 to 2305), saving some time and money. Moreover, the margin of error only rises from 0.019 to 0.020. The risk of suing the guess 0.60 for ̂ is that if the actual value of ̂ turns out to be between 0.40 and 0.60, then the achieved margin of error will exceed the specified 0.02. ̂ = 92/273 = 0.337; z0.05 = 1.645; the 90% confidence in...
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This document was uploaded on 02/06/2014.

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