PSYC 421 Psychological Testing &
Assessment Ch. 3-4 Question and
answers rated A+ 2025/2026
measurement - correct answer ✔the act of assigning numbers or symbols to characteristics of things
according to rules
scale - correct answer ✔a set of numbers whose properties model empirical properties of the objects
to which the numbers are assigned
error - correct answer ✔the collective influence of all of the factors on a test score of measurement
beyond those specifically measured by the test or measurement
nominal scales - correct answer ✔the simplest form of measurement. The scales involve classification
or categorization based on one or more distinguishing characteristics, where all things measured must
be placed into mutually exclusive and exhaustive categories
ex: gender, hair color
ordinal scales - correct answer ✔Permits classification and on some characteristic rank ordering is used.
They have no absolute zero point
ex: ranking on how you feel or satisfacation levels (1-5)
interval scales - correct answer ✔contain equal intervals between numbers. Each unit on the scale is
exactly equal to any other unit. No absolute zero point.
ex: temperature
ratio scales - correct answer ✔has a true zero point.
ex: height, weight
, distribution - correct answer ✔a set of test scores arrayed for recording or study
raw score - correct answer ✔a straightforward, unmodified accounting of performance that is usually
numerical
frequency distribution - correct answer ✔all scores are listed alongside the number of times each score
occured
grouped frequency distribution - correct answer ✔In this distrib. ..test score intervals aka class intervals
replace the actual test scores
histogram - correct answer ✔a graph w vertical lines drawn at the true limits of each test score,
forming a series of contiguous rectangles
bar graph - correct answer ✔numbers indicative of frequency also appear on the y axis and reference
to some categorization appears on the x axis
frequency polygon - correct answer ✔expressed by a continuous line connecting the points where the
test scores of class intervals meet frequencies
measure of central tendency - correct answer ✔a stat that indicates the average of midmost score
between the extreme scores in a distribution
arithmetic mean - correct answer ✔equal to the sum of the observations divided by the number of
observations
*formula from a frequency distribution on pg. 89
median - correct answer ✔the middle score
Assessment Ch. 3-4 Question and
answers rated A+ 2025/2026
measurement - correct answer ✔the act of assigning numbers or symbols to characteristics of things
according to rules
scale - correct answer ✔a set of numbers whose properties model empirical properties of the objects
to which the numbers are assigned
error - correct answer ✔the collective influence of all of the factors on a test score of measurement
beyond those specifically measured by the test or measurement
nominal scales - correct answer ✔the simplest form of measurement. The scales involve classification
or categorization based on one or more distinguishing characteristics, where all things measured must
be placed into mutually exclusive and exhaustive categories
ex: gender, hair color
ordinal scales - correct answer ✔Permits classification and on some characteristic rank ordering is used.
They have no absolute zero point
ex: ranking on how you feel or satisfacation levels (1-5)
interval scales - correct answer ✔contain equal intervals between numbers. Each unit on the scale is
exactly equal to any other unit. No absolute zero point.
ex: temperature
ratio scales - correct answer ✔has a true zero point.
ex: height, weight
, distribution - correct answer ✔a set of test scores arrayed for recording or study
raw score - correct answer ✔a straightforward, unmodified accounting of performance that is usually
numerical
frequency distribution - correct answer ✔all scores are listed alongside the number of times each score
occured
grouped frequency distribution - correct answer ✔In this distrib. ..test score intervals aka class intervals
replace the actual test scores
histogram - correct answer ✔a graph w vertical lines drawn at the true limits of each test score,
forming a series of contiguous rectangles
bar graph - correct answer ✔numbers indicative of frequency also appear on the y axis and reference
to some categorization appears on the x axis
frequency polygon - correct answer ✔expressed by a continuous line connecting the points where the
test scores of class intervals meet frequencies
measure of central tendency - correct answer ✔a stat that indicates the average of midmost score
between the extreme scores in a distribution
arithmetic mean - correct answer ✔equal to the sum of the observations divided by the number of
observations
*formula from a frequency distribution on pg. 89
median - correct answer ✔the middle score
