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Limit for the population proportion of voters

A random sample of 100 voters found that 44% were going to vote for a certain candidate. Find the 99% limit for the population proportion of voters who will vote for that candidate.

A. 31.2% < p < 56.8%

B. 32.7% < p < 55.3%

C. 34.3% < p < 53.7%

D. 37.6% < p < 50.4%

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## Q : Effect size of the new preparatory course

The mean score of the overall population of high school seniros is known to be 455 with a standard deviation of 100. the mean score for thsoe who took the course was 500. Compute the effect size of the new preparatory course?