Modern Elementary Statistics Student Solutions Manual
A study made by a staff officer of armored division showed that in a random sample of days the division had on the average vehicles in operation condition with the population standard deviation of vehicles in operation condition. It is asserted by the officer with confidence about the maximum error, if he uses the sample average of vehicles as an estimate of the actual daily average number of vehicles of armored division in operation condition.
The degree of confidence is denoted as. Here, the degree of confidence of the officer is. Then, the expression of degree of confidence can be written as, So,. Also, From the standard normal table, the critical value of z at is. Suppose, sample average number of vehicles in operation condition.
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Population standard deviation.