Stats/Psych Research Chapter 2

All scales possess magnitude, equal intervals between adjacent units, and an absolute zero point.

false

If the remainder of a number is .5, we always round the last digit up.

false

Most scales used for measuring psychological variables are either ratio or interval.

false

Nominal scales can be used either qualitatively or quantitatively.

false

The number of students in a class is an example of a continuous variable.

false

With the exception of division, one can perform all mathematical operations on a ratio scale.

false

ordinal scale

one in which the numbers on the scale represent rank orderings, rather than raw score magnitudes

interval scale

one in which the unit represent raw score magnitudes, there are equal intervals between adjacent units on the scale, and there is no absolute zero point

ratio scale

one in which the units represent raw score magnitudes, there are equal intervals between adjacent units on the scale, and there is an absolute zero point

discrete variable

one in which there are no possible values between adjacent units on the scale

nominal scale

one that has categories for the units

continuous variable

one that theoretically can have an infinite number of values between adjacent units on the scale

real limits of a continuous variable

those values that are above and below the recorded value by one-half of the smallest measuring unit of the scale

summation

to sum all or part of the scores in the distribution

An interval scale is like a ratio scale, except that the internal scale doesn't possess an absolute zero point

true

Classifying students into whether they are good, fair, or poor speakers is an example of ordinal scaling

true

If IQ was measured on a ratio scale, and John had an IQ of 40 and Fred an IQ of 80, it would be correct to say that Fred was twice as intelligent as John.

true

The number of children in a classroom is an example of a discrete variable.

true