<PRE><B>Question 512911</B>
From a large number of actuarial exam scores, a random sample of 250 scores is selected, and it is found that 177 of these 250 are passing scores.
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Based on this sample, find a 90% confidence interval for the proportion of all scores that are passing. Then complete the table below.
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p-hat = 177/250 = 0.708
ME = 1.645*sqrt[0.708*0.292/250] = 0.047
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Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. 
What is the lower limit of the 90% confidence interval?::0.71-0.05 = 0.66
What is the upper limit of the 90% confidence interval?::0.71+0.05 = 0.76

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Cheers,
Stan H.
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