A Sample of 20 Men Have Been Asked to Give

Multiple Choice

A sample of 20 men have been asked to give their opinions on the use of electric razors before and after using a new kind of electric razor. The proper statistical test for examining the data is

A) the t-test of the difference between means.
B) the paired difference test.
C) analysis of variance.
D) regression analysis.
E) none of the above.