dolution
dolution.
According to the Office for National Statistics’
, the average weekly wage of a professional is £704.1 a week and the average weekly wage of a manager and senior official is £721.7. Assume that such wages are normally distributed in the population and that the population variances are equal. Suppose these figures were actually obtained from the data below.
a. Use these data and 
 0.10 to test to determine if there is a signifi cant diff erence in the mean weekly wage of a professional and the mean weekly wage of manager and senior official.
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Order Paper Nowb. Using these same data, construct a 90% confi dence interval to estimate the difference in the population mean weekly wages of professionals and managers and senior officials.
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