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## A market trader sells ball-point pens on his stall. He sells the pens for a different fixed price, x pens, in each of six weeks. He notes the number of pens, y that he sells in each of these six weeks. The results are shown in following table.   Week 1 2 3 4 5 6 Pens 10 15 20 25 30 35 Sells 68 60 55 48 38 32       Find the correlation coefficient between pens and sells and test the hypothesis that there is no relation between these variables. Find the regression equation of sells to pens Estimate the weekly sells for 20 pens. Estimate the Error.

. 4 A market trader sells ball-point pens on his stall. He sells the pens for a different fixed price, x pens, in each of six weeks. He notes the number of pens, y that he sells in each of these six weeks. The results are shown in following table.

 Week 1 2 3 4 5 6 Pens 10 15 20 25 30 35 Sells 68 60 55 48 38 32

1. Find the correlation coefficient between pens and sells and test the hypothesis that there is no relation between these variables.
2. Find the regression equation of sells to pens
3. Estimate the weekly sells for 20 pens.
4. Estimate the Error.
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