A scientist was asked to test the effect of a new vitamin for rats. His hypothesis was that young rats that had vitamins added to their food would
gain weight faster than young rats fed a normal diet. He predicted that if
young rats were fed vitamins, then they would gain more weight by the end of
the experiment. He tested the effect of adding vitamins to some of the rats'
diet by measuring the amount of weight each rat gained after three months.
He then determined the average weight gained in each group. To analyze his
results, he put the data he collected into the table shown below.
Rats fed normal diet
Rats fed normal diet and vitamins
Rat#
Starting Ending
weight
weight
Difference
in weight
Rat #
Starting Ending
weight weight
Difference
In weight
1
256 g
3209
64g
1
2499
3429
93 g
2.
2749
347 9
739
2
221 g
3079
869
3
2099
268 g
599
3
278 9
381 g
1039
Averago
weight
gain
65 g
Average
weight
gain
949
How did the experiment test the hypothesis?