Let's analyze the data provided to determine the results of the experiment.
### For the Rats Fed Normal Diet:
1. Rat 1:
- Starting weight: [tex]\(256\)[/tex] grams
- Ending weight: [tex]\(320\)[/tex] grams
- Difference in weight: [tex]\(320 - 256 = 64\)[/tex] grams
2. Rat 2:
- Starting weight: [tex]\(274\)[/tex] grams
- Ending weight: [tex]\(347\)[/tex] grams
- Difference in weight: [tex]\(347 - 274 = 73\)[/tex] grams
3. Rat 3:
- Starting weight: [tex]\(209\)[/tex] grams
- Ending weight: [tex]\(268\)[/tex] grams
- Difference in weight: [tex]\(268 - 209 = 59\)[/tex] grams
The weight differences for the rats fed a normal diet are 64 grams, 73 grams, and 59 grams.
### For the Rats Fed Normal Diet and Vitamins:
1. Rat 1:
- Starting weight: [tex]\(249\)[/tex] grams
- Ending weight: [tex]\(342\)[/tex] grams
- Difference in weight: [tex]\(342 - 249 = 93\)[/tex] grams
2. Rat 2:
- Starting weight: [tex]\(221\)[/tex] grams
- Ending weight: [tex]\(307\)[/tex] grams
- Difference in weight: [tex]\(307 - 221 = 86\)[/tex] grams
3. Rat 3:
- Starting weight: [tex]\(278\)[/tex] grams
- Ending weight: [tex]\(381\)[/tex] grams
- Difference in weight: [tex]\(381 - 278 = 103\)[/tex] grams
The weight differences for the rats fed a normal diet with vitamins are 93 grams, 86 grams, and 103 grams.
### Calculating the Average Weight Gain
1. Average weight gain for the rats fed a normal diet:
[tex]\[
\text{Average weight gain} = \frac{64 + 73 + 59}{3} = 65.33 \text{ grams (approx)}
\][/tex]
2. Average weight gain for the rats fed a normal diet with vitamins:
[tex]\[
\text{Average weight gain} = \frac{93 + 86 + 103}{3} = 94 \text{ grams}
\][/tex]
### Conclusion:
The data shows a clear pattern. The rats fed with vitamins gained more weight on average compared to the rats fed with a normal diet. Therefore, the results of the experiment support the scientist's hypothesis that young rats fed with vitamins gain more weight than those on a normal diet.
Thus, the answer is:
A. No pattern was seen in the data.
