Use the following to answer the questions below:
Zumba, often described as a Latin-inspired dance fitness party, is currently one of the most popular group fitness classes, but its health benefits have been little studied. An exercise science professor at a large university conducted a study to investigate some of the health benefits of Zumba. He recorded the weight of 9 female college students before they began a six week long Zumba program. As part of the program, they took a 60 minute long Zumba class three days a week. At the end of the program, the subjects were weighed again. Of interest is their weight loss, defined as weight before the program started minus weight after completing the program. The results are displayed in the following table.
| Student | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Before Weight | 134 | 152 | 145 | 120 | 136 | 129 | 163 | 147 | 131 |
| After Weight | 131 | 147 | 144 | 121 | 134 | 125 | 156 | 144 | 131 |
Difference
(Before - After) | 3 | 5 | 1 | -1 | 2 | 4 | 7 | 3 | 0 |
The mean weight loss for the sample was 2.667 pounds with standard deviation 2.5 pounds. A dotplot of the differences is provided.
Construct a 99% confidence interval for the mean weight loss. Use three decimal places in your margin of error.
▸ -0.521 to 4.813 pounds
▸ -0.129 to 5.463 pounds
▸ -0.316 to 5.081 pounds
▸ -0.223 to 5.111 pounds
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