At Abraham Lincoln High School an achievement test is used for college placement. Counselors selected a simple random sample of 30 students from the school and scored their tests by hand before sending them in for computer processing. For this sample, top enclose x equals 525 comma space s equals 25 . Construct a 99% confidence interval for mu, the population mean score for Abraham Lincoln High School. Round your answer to one decimal place.
t /2,df = 2.756
Margin of error = E = t/2,df * (s /n)
= 2.756 * (25 / 30)
Margin of error = E = 12.6
The 99% confidence interval estimate of the population mean is,
- E < < + E
525 - 12.6 < < 525 + 12.6
512.4 < < 537.6
(512.4 , 537.6)
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