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1- Students who graduate college with a degree in economics earn higher starting salaries than the...

1- Students who graduate college with a degree in economics earn higher starting salaries than the average college graduate- or so they say. A recent survey of 430 graduates, representing 7% of the total graduates at a major university, found that their average starting salary was 57,650$ with a standard deviation of 9,660$.

A- what is n?

B- What is a 90% confidence interval for average starting salaries for econ majors?

2- In question 1, how would the results change if the sample size had been increased by another 100 students? Explain the result.

Math   Statistics-And-Probability   
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