A physician wants to determine if a supplement is effective in helping men lose weight. She takes a random sample of overweight men and records their weight before the trial. She then prescribes the supplement and instructs them to take it for four weeks while making no other lifestyle changes. After the four-week period, she records the weight of the men again. Find the test statistic and degrees of freedom for an appropriate hypothesis test using the data set below. Let the difference d for each man be computed as d=after−before. Assume that the weights are normally distributed. Round the test statistic to three decimal places. Before (lbs) After (lbs) 240.6 234.1 221.1 219.5 206.4 203.7 235.4 232.4 244.1 244.5 219.9 217.8
A physician wants to determine if a supplement is effective in helping men lose weight. She takes a random sample of overweight men and records their weight before the trial. She then prescribes the supplement and instructs them to take it for four weeks while making no other lifestyle changes. After the four-week period, she records the weight of the men again. Find the test statistic and degrees of freedom for an appropriate hypothesis test using the data set below. Let the difference d for each man be computed as d=after−before. Assume that the weights are
|
Before (lbs) |
After (lbs) |
|
240.6 |
234.1 |
|
221.1 |
219.5 |
|
206.4 |
203.7 |
|
235.4 |
232.4 |
|
244.1 |
244.5 |
|
219.9 |
217.8 |
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