Scores on a certain test are normally distributed and a

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Scores on a certain test are normally distributed and a researcher wishes to estimate the mean score achieved by all students on the test. He was told that he would need a sample size of 100 to assure a 95 percent confidence interval with width=4. What is the sample size required if he is interested in constructing a 90% confidence interval with width=4?

A) 80

B) 6241

C) 71

D) 142

Reference no: EM13639640

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