Question 873043: A random sample of 625 SAT scores has a mean of 1500. Assume that SAT scores have
a population standard deviation of 250. Construct a 95% confidence interval estimate of the mean SAT scores. Show all work. Just the answer, without supporting work, will receive no credit
Answer by reviewermath(1029)   (Show Source):
You can put this solution on YOUR website! Q:
A random sample of 625 SAT scores has a mean of 1500. Assume that SAT scores have
a population standard deviation of 250. Construct a 95% confidence interval estimate of the mean SAT scores. Show all work. Just the answer, without supporting work, will receive no credit
A:
For the lower limit of the confidence interval, enter the following formula in Excel: =1500+NORMSINV(.025)*250/SQRT(625)
For the upper limit of the confidence interval, enter the following formula in Excel: =1500-NORMSINV(.025)*250/SQRT(625)
Therefore, the 95% confidence interval is (1480.4, 1519.6)
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