Chapter 4

Question 1

Common zone

Answer 1

The section of a distribution where s ores usually fall; commonly set to be the middle 95%.

Question 2

Extreme percentage

Answer 2

Percentage of the normal distribution that is found in the two tails and is evenly divided between them.

Question 3

Independence

Answer 3

In probability, when the occurrence of one outcome does not have any impact on the occurrence of a second outcome.

Question 4

Middle percentage

Answer 4

Percentage of the normal distribution found around the midpoint, evenly divided into two parts, one just above the mean and one just below it.

Question 5

Normal distribution

Answer 5

Also called the normal curve; a specific bell-shaped curve defined by the percentage of cases that fall in specific areas under the curve.

Question 6

Percentile rank

Answer 6

Percentage of cases with scores at or below a given level in a frequency distribution.

Question 7

Probability

Answer 7

How likely an outcome is; the number of ways a specific outcome can occur, divided by the total number of possible outcomes.

Question 8

Rare zone

Answer 8

Section of a distribution where scores do not usually fall; in most instances , set to be the extreme 5%.

Question 9

Standard score

Answer 9

Raw score expressed in terms of how many standard deviations it falls away from the mean; also known as a z-score

Question 10

Z-Score

Answer 10

Raw score expressed in terms of how many standard deviations it falls away from the mean; also known as standard score.