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Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

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BuyFindarrow_forward

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570
Textbook Problem

What are the boundaries for the middle 50% of all possible random samples of n = 25 scores selected from a normal population with μ = 80 and σ = 10?

To determine

To find: The boundaries for the middle 50% of all possible random samples of n=25 scores selected from a normal distribution with μ=80 and σ=10.

Explanation

Given info:

The random sample of n=25 scores is selected from a population with a mean of μ=80 and standard deviation of σ=10.

Calculation:

The formula for calculating the z-score:

z=MμσM

Where, σM=σn

The boundaries for the middle 50% of all possible random samples of n=25 scores is,

P(z<Z<z)=0.50

So,

z=M801025=(=NORMSINV(0

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