Window Year 1964 0 X 2) A marketing researcher used a multiplicative model to study annual...

 

 
 

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Window Year 1964 0 X 2) A marketing researcher used a multiplicative model to study annual sales of a product that had been introduced in 1964. The data were as follows, where X is year (coded) and Y is sales in thousands of units: Y, 1965 1 1967 3 120 135 162 181 215 234 1966 2 1968 4 1969 1970 1971 1972 5 6 7 8 277 313 374 a) Plot Y versus X. Discuss your result based on this preliminary plot. SEMP%202019-2010 C 1973 9 422 [2 marks] E Scholarship Sylpy b) Fit the data with the simple linear regression model and perform residual analysis. What do you conclude? [4 marks] tion of the data, state c) Linea the researcher's model by a suitable ! the transformed models thus obtained, and calculate the estimated regression for the transformed model. 15 marks] d) Plat the estimated regression line and the transformed data. Does the regression line appear to be a good fit? [2 marks TESTIMTM 2001-20 Window Year 1964 0 X 2) A marketing researcher used a multiplicative model to study annual sales of a product that had been introduced in 1964. The data were as follows, where X is year (coded) and Y is sales in thousands of units: Y, 1965 1 1967 3 120 135 162 181 215 234 1966 2 1968 4 1969 1970 1971 1972 5 6 7 8 277 313 374 a) Plot Y versus X. Discuss your result based on this preliminary plot. SEMP%202019-2010 C 1973 9 422 [2 marks] E Scholarship Sylpy b) Fit the data with the simple linear regression model and perform residual analysis. What do you conclude? [4 marks] tion of the data, state c) Linea the researcher's model by a suitable ! the transformed models thus obtained, and calculate the estimated regression for the transformed model. 15 marks] d) Plat the estimated regression line and the transformed data. Does the regression line appear to be a good fit? [2 marks TESTIMTM 2001-20

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