With reference to Exercise 8.5, test the null hypothesis that \(\sigma=0.75\) hours for the time that is required for repairs of the second type of bulldozer against the alternative hypothesis that \(\sigma>0.75\) hours. Use the 0.10 level of significance and assume normality.

Data From Exercise 8.5

8.5 An investigation of two types of bulldozers showed that 50 failures of one type of bulldozer took on an average 6.8 hours to repair with a standard deviation of 0.85 hours, while 50 failures of the other type of bulldozer took on an average 7.3 hours to repair with a standard deviation of 1.2 hours. - (a) Test the null hypothesis 1 = 0 (namely, the hypothesis that on an average, it takes an equal amount of time to repair either kind of bulldozer) against the alternative hypothesis p - 20 at the level of significance, = 0.10.