kindly helpme with these 2 problems :(

Problem 11 and acid concentration .13. An article in Technometrics (1974, Vol. 16, pp. 523-531) considered the following stack-loss data from a plant oxidizing ammonia to nitric acid. Twenty-one daily responses of stack loss (the amount of ammonia escaping) were measured with air flow X1, temperature X2, (a) Fit a linear regression model relating the results of the stack loss to the three regressor variables. Round your answers to two decimal places (e.9. 98.76). Round your answer to two decimal places (e.9. 98.75). (c) Use the model in part (a) to predict stack loss when X1 = 62, x2 = 27, and x3 = 84. Round your answer to one decimal place (e.g. 98.7). y = Reserve Problems Chapter 12 Section 1 Problem 1 During a research, the amount of Internet users was measured. Each time three random groups of 10,000 people of the average age of 20, 40, and 60 were considered. The data are as follows (x1 - the number of years since the beginning of the research, X2 - age, y - number of users): 1800 1550 240 3400 2900 590 4850 4510 1210 6590 6030 1620 X1 1 1 1 3 3 3 5 5 5 7 7 7 *2 20 40 60 20 40 60 20 40 60 20 40 60 (a) Fit a multiple linear regression model using x] and x2 as the regressors. Round your answers to one decimal place (e.g. 98.7). V= (b) Estimate 62 . tound your answer to the nearest integer (e.g. 9876). (c) Find the standard errors of the regression coefficients. Round your answers to one decimal place (e.g. 98.7). se (Bo) = 1: se (B1 ) = ; se ( B2) = (d) Use the model to predict the number of users in random group of 40 years after 4 years of research. Round your answer to the nearest integer (e.g. 9876). Number of users =