Question: 13.1. The data given below are for thicknesses in 0.00001 in. of nonmagnetic coatings of galvanized zinc on 11 pieces of iron and steel. The

13.1. The data given below are for thicknesses in 0.00001 in.

of nonmagnetic coatings of galvanized zinc on 11 pieces of iron and steel. The destructive (stripping) thickness is y; the nondestructive (magnetic) thickness is x:

x 105 120 85 121 115 127 630 155 250 310 443 y 116 132 104 139 114 129 720 174 312 338 465 We find n¼11, P x¼2461, P y¼2743, P x2 P ¼852,419, y2¼1,067,143, P xy¼952,517.

a. Plot a scatter diagram and comment.

b. Find r, bo, b1 and sy.x, write the estimation equation and draw it on the scatter diagram.

c. Is r significant?

d. Estimate y, if x¼150.

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