a) Kyle is working on a statistics problem and knows that the population standard deviation is 12.  He calculated a 99% confidence interval and determined that the error was 3.77. What was Kyle’s sample size? b). For a typical z-interval, the mean is 64, the standard deviation is 12, and the sample size is 81. If the interval is from 60.565 to 67.435, what is the  z*  value?, and what confidence level was used?

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