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Essentials of Statistics for the B...

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

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Chapter
Section
BuyFindarrow_forward

Essentials of Statistics for the B...

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

Find the z-score boundaries that separate a normal distribution as described in each of the following.

a. The middle 30% from the 70% in the tails.

b. The middle 40% from the 60% in the tails.

c. The middle 50% from the 50% in the tails.

d.    The middle 60% from the 40% in the tails.

a.

To determine

To find: Thez-score that separates the middle 30% from the 70% in tail.

Explanation

Given info:

Given distribution is normal z score separates the middle 30% of the distribution from the 70% in the tail.

Justification:

As given in the question that z-score separates the middle 30% of the distribution from the 70% in the tail. It also means that left tail is 35%, in other words the left tail area from z-score value is 0...

b.

To determine
The z-score that separates the middle 40% from the60% in tail.

c.

To determine
The z-score that separates the middle 50% from the50% in tail.

d.

To determine
The z-score that separates the middle 60% from the40% in tail.

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