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What is the critical z-value that corresponds to a confidence level of 88% approximately 1.48 approximately 1.55 approximately 1.75 approximately 2.11 14. Compute the population mean margin of error for a 99% confidence interval when sigma is 4 and the sample size is 36. ± 1.3066... ± 1.0966... ± 1.7166... none of these 15. A standard IQ test has a mean of 98 and a standard deviation of 16. We want to be 90% certain that we are within 8 IQ points of the true mean. Determine the sample size. 27 11 10 none of these
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Experience: B.S. Mechanical Engineering