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We have to construct a confidence interval

by | Dec 1, 2023 | Posted Questions

Consider the following for the questions 7-9

We have to construct a confidence interval for the mean of SAT (verbal and quantitative) scores of students who use a special coaching. How large a sample must be taken to participate in the coaching group to estimate this mean with a margin of error of no more than 25 points if we can assume that the population standard deviation is 175 points for the reference population?

Compute the required sample size for each of the following confidence levels.

1. 90% confidence

2. 95% confidence

3. 99% confidence

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