PSYC 626: Session 3

Match the following Scales of Measurement to Their Definitions

• Has an absolute 0 point

• Nominal

• Names for data points & order matters

• Ordinal

• Names for data, order doesn't matter

• Ratio

• No Starting Point or True Zero Point

• Equal Interval

Drag each label to the appropriate location on the blank normal curve distribution

a

b

c

Asymptotic Tail

Mean=Median=Mode

Symmetrical Sides

What are the two kinds of skewed distributions shown in this image?

a

b

Negatively Skewed

Positively Skewed

Which of the following is NOT a risk of dichotomizing continuous data based on today's lecture?

• Information is lost

• It may increase the risk of "false positives"

• Dichotomizing is too difficult for most researchers to do

• It may underestimate the amount of variability between groups

Match the following score types to their definitions

• Distance from mean on IQ test

• Stanines

• Divides distribution into 9 parts

• Deviation IQ

• % of people at or below obtained score

• Percentile Ranks

• Measured in terms of SD from the mean

• z-score

Match the Common Summary Score Type to its Definition

• What we can hold on to and remember

• Retention/Recall

• Often paired w/ labels for instruction

• Fluency

• #correct within given time frame

• Accuracy

• #correct divided by # of attempts x 100

• Percent Correct

What kinds of interpretations compare performance to state benchmarks/guidelines?

• Norm-Referenced

• High-Stakes

• Standards-Referenced

• Subjective

What are the four components of Standards-Referenced Interpretations? Select ALL that apply.

• Levels of Performance

• Objective Criteria

• Examples of Each Level for Scoring Purposes

• Cut Scores

True or False: A test's norm group is often made up of multiple smaller norming groups.

• True

• False

What kinds of correlations imply that there is no linear relationship between the variables of interest? Select ALL that apply

• Positive

• Negative

• Zero-Order