For raw score, use SD, but for means, use Standard Error of the mean (SEm).
99% = mean ± 2.585 SEm
SEm = SD/√n
Computer Depot is a large store that sells and repairs computers. A random sample of 110 computer repair jobs took technicians an average of 93.2 minutes per computer. Assume that o is known to be 16.9 minutes. Find a 99% confidence interval for the population mean u for the computer repairs. Interpret the interval in the context of this problem. State what assumptions were met to use the method you selected.
2 answers
678 to 56.8
1 answer