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A poll was taken this year asking college students if they considered themselves overweight. A similar poll was taken five years ago. Results are summarized below. 

Sample Size Number Considered Themselves Overweight

Present Sample 300 150

Previous sample 275 121

  1. Develop a 95% confidence interval estimate for the difference between the proportions of students who considered themselves overweight in the two samples. 
  2. Is there conclusive evidence that one of the proportions is significantly different than the other? Explain using the results of part a. Do not perform any test.

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