Answer Happy

QUESTION 3 - 17 MARKS The following table lists the monthly sales and advertising expenditures for 10 months of last year by a digital electronics company, Sales (RM 000's) $: 104 110 112 115 117 116 118 120 121 123 Advertising (RM 000's) a: 41 6 6.5 6.8 7.2 74 78 8.1 10 6 7 a. Calculate the following: i Mean of advertising expenditures [1 mark) ii. Standard deviation of advertising expenditures [1 mark) b Determine the independent variable and the dependent variable for predicting from a [1 mark] Determine the value of the correlation coefficient, Tas, between the monthly sales and advertising expenditures and state the significance of the relationship [2 marks] d Given the covariance, Sas, between the monthly sales and advertising expenditures is equal to 7.386, find the equation of the least squares regression line for predicting sales from advertising expenditures. [3 marks] Use the least squares regression equation found in (d) to estimate the monthly sales given that the advertising expenditures spent in that particular month is RM 5,900. [1 mark)