Question
Asked Oct 31, 2019
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Use the standard normal distribution (aka z distribution where mu = 0 and sigma = 1) to determine the values of Z that will give you the middle 85% of the data.

Note that each answer above requires TWO values of Z. 

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Expert Answer

Step 1

Consider,

 -a and +a be

Consider,

 -a and +a be two middle values that cover 85% of the area.

Thus,

two middle values that cover 85% of the area.

Step 2

Thus,

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Image Transcriptionclose

P(-a<Z< a) 0.85 P(Z <a)-P(Z<-a)= 0.925-0.075 P(Z <a) 0.925 a 1.44

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Step 3

The area left of 1.44 is 0.925 is taken from the...

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Math

Statistics

Hypothesis Testing

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