1. In what sense do linear transformations involve a straight line?
2. An r of .60 was obtained between points earned on a spelling test and IQ for all current members of the sixth grade in a particular school. For each of the following, state whether the correlation would be affected, and if so, how. If it would be affected in an unpredictable manner, say so. Treat each question as independent of the others.
(a) Score in spelling is changed to number of answers not correct.
(b) Each IQ is divided by 10. (c) Ten points are added to each spelling score.
(d) Ten points are added to each spelling score and each IQ is divided by 10.
(e) Spelling scores are converted to z scores.
(f) Spelling scores are converted to z scores and IQ to standard scores with a mean of 50 and a standard deviation of 10.