Chapter 6

Question 1

Percentile

Answer 1

The score at or below which a specified percentage of all scores in the distribution fall.

Question 2

Percentile rank

Answer 2

The percentage of scores equal to or less than the given score.

Question 3

Standard score or z score

Answer 3

A variable whose value counts the number of standard deviations a score above or below the mean.
For example, z = 0 (denotes the mean itself); z=1 is one standard deviation above the mean; z=2 is two standard deviations above the mean; z= -1 is one standard deviation below the mean

Question 4

Score

Answer 4

The value of any variable.

Question 5

Raw score

Answer 5

A value of the variable in the original scale of measurement.

Question 6

What tells you the position of a point within its distribution?

Answer 6

Percentiles, percentile ranks and standard scores.

Question 7

What is often the most useful information in frequency distributions?

Answer 7

The areas under portions of the curve.

Question 8

Relative area

Answer 8

The proportional (or fractional) area under a frequency distribution.

Question 9

Normal distribution

Answer 9

Any of a family of symmetric, unimodal, asymptotic, distributions obtained by specifying values of the mean of the population and the standard deviation of the population.

Question 10

Unit normal distribution

Answer 10

A normal distribution with mean of the population =0 and standard deviation =1.

Question 11

What are the percentages under the normal curve?

Answer 11

34%, 14%, 2%

Question 12

Interpolation

Answer 12

Finding a value located proportionately between two values on a table.

Question 13

Standardized variable

Answer 13

A normally distributed variable that has the mean of the population and standard deviation for the population.