QUESTION 40 Questions 39 43 concern the following idea: Asheep farmer in WA ls considering changing breeds of sheep in the hope they will produce more wool (call the two breeds "new" and "old"). 10 sheep of each variety are raised in the same paddock and their rst ileece is weighed. The data is analysed in R via a 2sample ttest with a 2sided hypothesis, and the output is summarized below (with some parts obscured with T?) Two Sample ttest data: weight by type t=1.9387, df= ??, pvalue = 0.06838 alternative hypothesis: true dierence in means is not equal to l] 95 percent condence interval: ?? ?? mean sd n new 5. BB 0 .338 1 0 old 4.98 0.??6 10 Levene's Test for Homogeneity of Variance (center = "mean") Df Fvalue Pr(>F} group 1 0.0012 0.9?3 18 Let IJA and PB denote the mean amount 01 wool produced trom the "new" and "old" breeds of sheep respectively, and DA and 0B be the respective standard deviations In answering the questions below, use a = 0.05 where necessary. What is the pooled estimate of standard deviation [give your answer to 4dp)