5. The "Highyield" Fertilizer Company has produced a new fertilizer which they claim will improve crop yield. Because of soil composition differences, rainfall differences, etc, the crop yield when this nevi.r fertilizer is used is a random variable. Suppose that this random variable has a probability distribution with (unknown) mean u and (mlknown) variance (:2. To test their claim, we sow 28 plots of ground with the new fertilizer, and eventually get crop yields (in hundredweight per acre) as follows:- 14.8 16.8 15.3 15.5 15316.8 110 14.8 16.2 15.1 15.8 14.8 15.3 15.9 13.3 14.5 14.8 18.?r 14.9 15.8 Use these data to estimate it and 02 and to find two numbers between which you are 95% certain