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

Resolved Question:

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