Please solve them step by step

7.3.5) Suppose that 531, 92, and 93 are estimators of 9. We know that 3(91) = E(2) = 9, 5(3) 1: 9' V(1)= 14, HQ) = 12 and 5(, _ 9): = a. (a) Which do you prefer between the rst two estimators? (b) Compare these three estimators. Which do you prefer? Why? 7.3.6) Data on pull-off force (pounds) for connectors used in an automobile engine application are as follows: 79.0, 75.1, 78.3, 74.5, 73.8, 75.1, 77.5, 77.8, 73.3, 74.6, 75.0, 74.4, 74.7, 75.4, 72.8, 73.6, 74.1, 78.2. 75.6, 76.7. 74.8, 78.1. 75.6, 76.7. 75.4, 76.0. (a) Calculate a point estimate of the pull-off force of all connectors in the population. State which estimator you used and why? (b) Calculate a point estimate of the median pull-off force. (c) Calculate point estimates of the population variance and the population standard deviation. (d) Calculate the standard error of the point estimate found in part (a). Interpret the standard error. (e) Calculate a point estimate of the proportion of all connectors in the population whose pull-off force is less than 75 pounds