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(5 pts) Consider the relationship between the number of bids an item on eBay received and...

  1. (5 pts) Consider the relationship between the number of bids an item on eBay received and the item's selling price. The following is a sample of 5 items sold through an auction.

           

Price in Dollars

110

120

150

190

200

210

220

225

230

231

232

235

Number of Bids

10

13

15

17

18

19

17

20

21

20

22

23

           

Create a scatter plot to determine if there is any linear relationship between selling price and number of bid. Calculate the correlation coefficient, r. Round your answer to three decimal places.

            Answer: ____________________

math   Statistics-And-Probability   
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Answer #1

.

X Y X⋅Y X⋅X Y⋅Y  
110 10 1100 12100 100
120 13 1560 14400 169
150 15 2250 22500 225
190 17 3230 36100 289
200 18 3600 40000 324
210 19 3990 44100 361
220 17 3740 48400 289
225 20 4500 50625 400
230 21 4830 52900 441
231 20 4620 53361 400
232 22 5104 53824 484
235 23    5405    55225    529
ΣX=2353 ΣY=215 ΣXY=43929 ΣX2=483535 Σy2=4011

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