Iinformation about confidence interval estimation

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The security department of a state university is planning its budget for the next year. In estimating the man-hours for security during university sponsored music concerts, the average length of music concerts is needed. A random sample from thirty-six security departments at universities was taken and the sample mean length of concerts was 160 minutes. Suppose the population standard deviation is 45 minutes. A 95 percent confidence interval for the true mean duration of music concerts is for this one I came up with 2 solutions 147.63 to 172.37 and when doing it over to check i got 145.3 to 174.7

Reference no: EM13105721

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