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What is the critical z-value that corresponds to a ...

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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
Submitted: 9 years ago.
Category: Homework
Expert:  abozer replied 9 years ago.
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