The third quartile always has area 0.75 to its left. Area = 0.75 APPLY YOUR KNOW

Question

The third quartile always has area 0.75 to its left. Area = 0.75 APPLY YOUR KNOWLEDGE Table A. satisfies each of the following conditions. (Use the value of z from Table A that comes closest to satisfying the condition.) In each case, sketch a standard Normal curve with your value of z marked on the axis. (a) The point z with 25% of the observations falling below it. (b) The point z with 40% of the observations falling above it. IQ test scores. approximately Normally distributed with 100 and = 15. (a) What scores fall in the lowest 25% of the distribution? (b) How high a score is needed to be in the highest 5%? 3.13 Use Table A to find the value z of a standard Normal variable that 3.14 Scores on the Wechsler Adult Intelligence Scale are

Explanation / Answer

3.13

a) From z Table

at p value=.25

z score will be -0.6745

b)at .40 p value

z score will be -0.2535

3.14

a) at p value .25

z value will be -0.6745(from z table)

at will the value will be 89.881

b)

from z table

Z = 1.64485

at this z score value will be 124.67

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