The variables in the file ASSIGN, in order from column 1 by column 8, are:
Week, SalesExp (unit sales in experimental group), SalesCntl (unit sales in control group), BPriceExp (brand's own price in experimental group), BpriceCntl (brand's own price in control group), CPriceExp (competitive brand's price in experimental group), CPriceCntl (competitive brand's price in control group), and DUM (defined above).
To prove the accuracy of the data you have, you may compare the means of every variable in the data with the numbers below:
Variable Mean Variable Mean
SalesExp 7089.7 SalesCntl 6687.7
BPriceExp 1.213 BPriceC ntl 1.218
CPriceExp 1.176 CPriceC ntl 1.144
1a. Run a regression of SalesExp against BPriceExp and CPriceExp. Given the estimated regression equation.
1b. Are the signs of the coefficients intuitive?
1c. Is there evidence to end that an increase in the own price leads to a reduce in sales in the experimental group? Set up the appropriate hypotheses and conduct the test. Use 95% confidence.