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. The monthly starting salaries of students who receive an MBA degree have a standard deviation of $120 What size sample should be selected to obtain a 90% confidence of estimating the mean monthly income within ± $1575 points

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Answer #1
for 90 % CI value of z= 1.6449
standard deviation σ= 120
margin of error E = 15
required sample size n=(zσ/E)2                                         = 174
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