A+ Work

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Sales   Advertising     Price       # of stores

41        20                    40           1

42        40                    60           3

59        40                    20           4

60        50                    80           5

81        50                    10           6

80        60                    40           6

100      70                    20           7

82        70                    60           8

101      80                    30           9

110      90                    40           10

Hills Lighting believes that several factors influences light fixture sales. Sales are in thousands, advertising are in hundreds of dollars, and price is the unit retail price.

  • Estimate a simple linear regression that only involves sales and advertising. Interpret the slope coefficient as well as R square. Show all work.
  • Estimate a multiple linear regression using all the data. Interpret the slope coefficient, R square, and the adjusted R square. Show all work.