The means and mean absolute deviations of sidney’s and phil’s grades are shown in the table below. means and mean absolute deviations of sidney’s and phil’s grades sidney phil mean 82 78 mean absolute deviation 3.28 3.96 which expression represents the ratio of the difference of the two means to sidney’s mean absolute deviation?

Based on the given table, the mean grade of Sidney is 82, and the mean grade of Phil is 78.  Moreover, the mean absolute deviation of Sidney is 3.28, and the mean absolute deviation of Phil is 3.96.

To find the difference between the two means, we just need to subtract the means of their grades. That is 82-78 or 4. 

Therefore, the ratio of the difference of the two means to Sidney’s mean absolute deviation is  or  or 1.2195.
     

The scale factor of what ?