15. The Cost of Lumber A builder wants to compare the prices per 1000 board meters of standard or better grade framing lumber. He randomly selects five suppliers in each of the four states where he is planning to begin construction. The prices are given in the table

a. What type of experimental design has been used?

b. Construct the analysis of variance table for this data.

c. Do the data provide sufficient evidence to indicate that the average price per 1000 board meters of framing lumber differs among the four states? Test using a 5.05.

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State 1 2 3 4 $261 $236 $250 $265 255 240 245 270 258 225 255 258 267 233 248 275 270 240 260 275