The annual maintenance bills of similar buildings in down town Nairobi were related to theirage with the following results. First row age A. Age (yrs) and second row M. Maintenance bills (000 shs)Age 155254052010304451525351030M3924115 105508667901401127018643126a) fit a regression line to this data (5 marks)b) find the 95 % confidence interval estimate of the maintenance cost of the building forage in years, assuming the data is homoscedastic (5 marks)c) Test the significance of the regression coefficients b and a at the .05 significance level (5 marks)