5. Do the following for the scores in practice problems

(a) 6,

(b) 7, and

(c) 8:

(i) Figure a t test for independent means, (ii) figure the correlation coefficient

(between the group that participants are in and their scores on the measured variable), (iii) figure the t for significance of the correlation coefficient (using the formula t = r>211 - r 22>1N - 22) and note explicitly the similarity of results, and (iv) make a scatter diagram. (v) For

(a) only, explain the relation of the spread of the means, and the spread of the scores around the means, to the t test result.