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In a random sample of 20 people with advance degree in biology, the mean monthly income...

In a random sample of 20 people with advance degree in biology, the mean monthly income was $4744 and the standard deviation was $580. Assume income are normally distributed. a. Construct 99% confidence interval for the mean monthly income for people with advance degrees in biology. b. What happens to the width of the confidence interval if you construct a 90% confidence level. (Does width get wider or narrower?) c. How does the width of the confidence interval change if the sample size was 50 instead of 20? (Does width get wider or narrower?)

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