Kindly solve this prob and stats question asap. Thank you.

Question it 7 [10 marks] A regression analysis was carried out to relate y : repairtime for machine (hours] to x1:elapsed time since previous service (months). X1= type of repair (1 if electrical, 0 if mechanical) yielded the following model based on 12 observations. Y = 0.95+0.450 x1+ 1.280 X2. SST=12.72, 55E: 2.07 and standard deviation of 31:0.315 5\" Is there a useful linear relation between the repairtime and predictors. (2) b. lfelapsed time stays in the model, does the repair provide useful information about repair time? State appropriate hypotheses using a significance level of 0.01. {3] Conduct a 95% Confidence interval for 132. (3) d. Predict repair time for the machine when repair is electrical and elapsed time is 6 months. [2) i"