wk 9

Question 1

covariance

Answer 1

does the variance in scores in one variable reflect the variance in scores in another?

Question 2

positive covariance

Answer 2

as the variance in one variable increased, the variance in the other also increases

Question 3

negative covariance

Answer 3

as the variance in one variable increases the variance in the other decreases

Question 4

why we use standardised tests

Answer 4

covariance is relative to the unit of measurement (unstandardised measure of relationship) so we use a correlation coefficient to standardise it.

Question 5

sun of squares

Answer 5

measures how far individual measurements are from the mean
subtract each measurement from the mean , square the difference and then add all the resulting measurements.

also measure the amount of variability in the data