11.17 The Cost of Lumber A national home builder wants to compare the prices per 2.4 cubic metres board of standard or better grade Douglas fir framing lumber. He randomly selects five suppliers in each of the four provinces where the builder 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 indi- cate that the average price per 2.4 cubic metres of Douglas fir differs among the four provinces? Test using a= 0.05.

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Province 1 2 3 4 $241 $216 $230 $245 235 220 225 250 238 205 235 238 247 213 228 255 250 220 240 255