For each of the following cases, indicate which statistic should be used. (do not re-write the whole sentence - just write the name of the appropriate statistics) a, We want to know how spread out or...

Extracted text: For each of the following cases, indicate which statistic should be used. (do not re-write the whole sentence - just write the name of the appropriate statistics) a, We want to know how spread out or heterogeneous the scores of a class are. b. We want to determine how Joe's score compares with the scores of the rest of the class, c, We want to know how well the class as a whole did on an examination. d. We want to predict the future achievement of students from their IQ.