in an experiment to determine whether there is a systematic difference between the weights obtained with two different mass balances, six specimens were weighed, in grams, on each balance. The following data were obtained: A B Specimen 1 2 3 4 5 6 12.31 9.60 10.06 6.21 6.49 10.30 12.34 9.58 10.07 6.20 6.47 10.29

Compute the test statistic.

a) 0.058

b) 0.170

c)0.379

d) 0.415