# problem-7.18

problem-7.18 No, it does not. The mean appears to be 98.2 . (See `http://hypertextbook.com/facts/LenaWong.shtml` for some discussion on this.)

    > t.test(normtemp$temperature,conf.level=.90)

            One Sample t-test

    data:  normtemp$temperature
    t = 1528, df = 129, p-value < 2.2e-16
    alternative hypothesis: true mean is not equal to 0
    90 percent confidence interval:
     98.14 98.36
    sample estimates:
    mean of x
        98.25