# During a research, the amount of Internet users was measured. Each time three random groups of...

###### Question:

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): y 1500 1250 180 3100 2600 530 4550 4210 910 6290 5730 1320 1 1 1 3 3 3 5 5 5 7 7 7 x1 X2 20 40 60 20 40 60 20 40 60 20 40 60 (a) Fit a multiple linear regression model using X1 and X2 as the regressors. Round your answers to one decimal place (e.g. 98.7). 1+1 Tait \x2 (b) Estimate o 02. Round 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). J; se(B) se(B.) 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 =

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