# Question find the z∗ values based on a standard normal distribution for each of the following. 5.42 (a) An 80% confidence interval for a proportion (b) An 84% confidence interval for a slope (c) A 92% confidence interval for a standard deviation I got A I think, 1.28?

Question

# find the *z*^{∗} values based on a standard normal distribution for each of the

following.

**5.42 (a) **An 80% confidence interval for a proportion

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**(b) **An 84% confidence interval for a slope

**(c) **A 92% confidence interval for a standard deviation

I got A I think, 1.28?