Homework answers / question archive / Week   Advertising    Sales  1             $ 1,200       $101,000  2            $ 800         $92,000  3            $ 1,000       $110,000  4            $ 1,300       $120,000  5            $ 700          $90,000  6            $ 800         $82,000  7            $ 1,000       $93,000  8            $ 600         $75,000  9            $ 900         $91,000  10          $ 1,100       $105,000 Questions 1) Draw a scatterplot 2) Determine the regression equation 3) Can we conclude a linear relation exists between Sales and Advertising? 4) What proportion of the change in Sales can be explained by changes in Advertising? 5) How closely correlated are Sales and Advertising? 6) Give a point and interval estimate for the change in Sales per extra Advertising dollar

Week   Advertising    Sales  1             $ 1,200       $101,000  2            $ 800         $92,000  3            $ 1,000       $110,000  4            $ 1,300       $120,000  5            $ 700          $90,000  6            $ 800         $82,000  7            $ 1,000       $93,000  8            $ 600         $75,000  9            $ 900         $91,000  10          $ 1,100       $105,000 Questions 1) Draw a scatterplot 2) Determine the regression equation 3) Can we conclude a linear relation exists between Sales and Advertising? 4) What proportion of the change in Sales can be explained by changes in Advertising? 5) How closely correlated are Sales and Advertising? 6) Give a point and interval estimate for the change in Sales per extra Advertising dollar

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Week   Advertising    Sales
 1             $ 1,200       $101,000
 2            $ 800         $92,000
 3            $ 1,000       $110,000
 4            $ 1,300       $120,000
 5            $ 700          $90,000
 6            $ 800         $82,000
 7            $ 1,000       $93,000
 8            $ 600         $75,000
 9            $ 900         $91,000
 10          $ 1,100       $105,000
Questions
1) Draw a scatterplot
2) Determine the regression equation
3) Can we conclude a linear relation exists between Sales and Advertising?
4) What proportion of the change in Sales can be explained by changes in Advertising?
5) How closely correlated are Sales and Advertising?
6) Give a point and interval estimate for the change in Sales per extra Advertising dollar.
7) Give a point and interval estimate for Sales in a week in which $850 was spent on Advertising.
8) Give a point and interval estimate for average sales when $850 is spent on Advertising weekly.

9) give a full report details