Washers In June 2007, Consumer Reports examinedtop-loading and front-loading washing machines, testingsamples of several different brands of each type. One ofthe variables the article reported was “cycle time”, thenumber of minutes it took each machine to wash a loadof clothes. Among the machines rated good to excellent,the 98% confidence interval for the difference in meancycle time (mTop - mFront ) is (-40, -22). a) The endpoints of this confidence interval are negativenumbers. What does that indicate?b) What does the fact that the confidence interval doesnot contain 0 indicate?c) If we use this confidence interval to test the hypothesisthat mTop - mFront = 0, what’s the correspondingalpha level?

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.