Semester 2 Lectures and Labs

Question 1

Reliability

Answer 1

consistency of scores over time

Question 2

Definition of a test

Answer 2

a Test is a measurement device or technique used to quantify or aid in the understanding or prediction of behaviour

Question 3

Features of a test

Answer 3

• standardised
• objective
• definition of a measure
• has items (questions)
• should be normed
• needs to be reliable and consistent

Question 4

Assumptions in tests

Answer 4

• it is valid
• behaviour on the test score will be stable over time
• individuals understand items similarly
• true score +/- error
• individuals will report accurately

Question 5

Why do we control the use of tests?

Answer 5

• misuse & misinterpretation
• prevent familiarity
• given by qualified administrator who can interpret the results accurately
• practice effects
• test results label people

Question 6

What is psychological measurement?

Answer 6

process of assigning numbers to a person in a way that the attributes of the person are faithfully reflected in the properties of the numbers

assigning numbers based on rules and definitions

Question 7

Measures of variability

Answer 7

range, interquartile range, outliers

Question 8

Standard deviation

Answer 8

is the square root of the variability.

gives us a point of reference in relation to the mean

Question 9

Z Scores

Answer 9

• score - mean / SD
• translates the score to a normal distribution
• standardises the results .: the results are more interpretable than raw scores

Question 10

Normal Curve

Answer 10

• assume 100% of the population is captured
• larger samples are more likely to be normally distributed
• A SD is the average distance a score falls from the mean

Question 11

Criterion based testing

Answer 11

• no comparison to other test takers
• focus is on what they can do/know
• not objective
• how many questions do you need to reliably assess the objectives?
• what is the threshold to pass?

Question 12

Correlation

Answer 12

• tells you the strength and direction of the relationship between two variables
• range -1 to +1
• we can’t make a prediction

Question 13

Regression

Answer 13

• similar to correlation
• can make predictions
• the stronger the correlation, the higher the predictive validity

Question 14

Y Hat

Answer 14

is the value on the prediction line

Question 15

A (Regression)

Answer 15

is the intercept on Y when X=0

Question 16

B (Regression)

Answer 16

Is the slope of the line

Question 17

Residuals

Answer 17

• ‘bits that don’t fit on the lone
• the more residuals the weaker the correlation
• the SD of the residuals gives us the standard error of the estimate

Question 18

Standard error of Estimate (SEE)

Answer 18

the SD of the residuals