Chapter Four Quiz

Using Appendix A in your text, what Z values mark the limits of the middle 75.40% of the area or cases under the normal curve?

+ or - 1.16

For a population with a standard deviation of 8 what is the Z score that corresponds to a score that is located 12 points above the mean?

+1.5

For a population with a standard deviation of 5 what is the Z score that corresponds to a score that is located 10 points above the mean?

+2

In the normal curve, the value of the mean is

0

Using Appendix A in your text, what percentage of area or cases under the normal curve will be found between the mean and a Z value of - 2.20?

0.4861

In the normal curve, the value of the standard deviation is

1

How much area under the curve is found beyond the z values of + or - 2.58?

1%

What percentage of scores/value lie outside a Z score of 1.96 in the normal distribution?

2.5%

What percentage of scores/values occupy an area between the mean and a Z score of -2.58 in the normal distribution?

49.51%

How much area under the normal curve is found beyond the Z values of + or - 1.96?

5%

The Z values of + or - 1.96 encompass what percentage of area under the normal curve?

95%

The Z values of + or - 2.58 encompass what percentage of area under the normal curve?

99%

Which of the following is true? a. Both the normal distribution and a normal distribution are theoretical b. A normal distribution is empirical and the normal distribution is theoretical c. A normal distribution is theoretical and the normal distribution is empirical d. None of these are true

A normal distribution is empirical and the normal distribution is theoretical

Which of the following z score values represent the location closest to the mean? a) Z = -1.00 b) Z= +1.00 c) Z= +0.50 d) Z= -2.00

Z = + 0.50

Which of the following Z scores is the farthest from the mean? a. z = -1.00 b. z = +1.00 c. z = +.50 d. z = - 2.00

Z= -2.00

Which of the following Z scores represents the mean? a. Z = +1.00 b. Z = 0 c. Z = - 1.00 d. Z = + 1.96

Z= 0

A Z-score is

a point along the baseline of the normal curve the ratio of the difference between a score and the mean, divided by the standard deviation

The normal curve/distribution is

a symmetrical distribution

The normal curve/distribution is based upon

an infinite number of cases

The normal curve/distribution is a(n)

theoretical curve/distribution