If a scale allows one to say whether a particular instance has more, less, or the same amount of an attribute as another instance, the scale is said to have

a. cross validity.
b. measurement.
c. magnitude

An independent-measures research study uses a total of 40 participants to compare two treatment conditions. What is the df value for the t statistic for this study?

a. 18 c. 38 b. 19 d. 39

Muscular dystrophy results from exposure to some viruses

a. True b. False Indicate whether the statement is true or false