Researchers have studied the role that the age or workers has in determining the hours per month spent on personal tasks. A sample of 1,686 adults were observed for one month. The data are:Age Group18-24 25-44 45-64Mean 4.17 4.04 4.31Std Dev 0.75 0.81 0.82N 241 768 677Construct a 95 percent confidence interval for the mean hours spent on personal tasks for 45-64 year olds.a[4.10, 4.19]b[4.19, 4.28]c[4.25, 4.37]d[4.38, 4.44]
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