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Unformatted text preview: 7 [5] What is the probability that the standard normal variable, z, is between .57 and 1.98? 8. [10] Calculate the probability that the class average test score is between 72 and 79. The number of students taking the exam is 64 and the test score mean=75 and the standard deviation=20. 9. [15] Calculate the 95% confidence interval for the population mean using the following data: x 9 61 2 5 7 3 9 10. [10] The mean price of purchases is $110 and the standard deviation=$12. What is the probability of a purchase exceeding $90? 11. [10] Calculate the 99% confidence interval for the population proportion of liberal donors to charity. A sample of 160 liberals indicates 48 donated. 12 [10] Calculate the 95% confidence interval for the population mean. A sample of 81 had a sample mean=320 and standard deviation=25....
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 Spring '10
 VANDERHOFF
 Statistics, Normal Distribution, Probability, Standard Deviation

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