Question

FInd the z* values based on a standard normal distribution for each of the following: (no...

FInd the z* values based on a standard normal distribution for each of the following: (no table provided)

a. An 88% confidence interval for a correlation

b. A 66% confidence interval for a slope

Math   Statistics-And-Probability   
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Answer #1

We want to find the z* values based on a standard normal distribution for each of the following,

a) An 88% confidence interval for a correlation

Significance level = 1 - 0.88 = 0.12

Therefore, z-score corresponds to probability 0.94 is,

z* = 1.555

Excel command: =NORMSINV(0.94) = 1.555

b)  A 66% confidence interval for a slope

significance level = 1 - 0.66 = 0.34

Therefore, z-score corresponds to probability 0.83 is,

z* = 0.954

Excel command: =NORMSINV(0.83) = 0.954

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