# Question: The relationship between the diameter of a spot weld x

The relationship between the diameter of a spot weld, x, and the shear strength of the weld, y, is very useful. The diameter of the spot weld can be measured after the weld is completed. The shear strength of the weld can be measured only by applying force to the weld until it breaks. Thus, it would be very useful to be able to predict the shear strength based only on the diameter. The following data were obtained from several sample welds.

Complete these questions with the aid of a computer.

a. Draw a scatter diagram.

b. Find the equation for the line of best fit.

c. Is the value of b1 significantly greater than zero at the 0.05 level?

d. Find the 95% confidence interval for b1.

Complete these questions with the aid of a computer.

a. Draw a scatter diagram.

b. Find the equation for the line of best fit.

c. Is the value of b1 significantly greater than zero at the 0.05 level?

d. Find the 95% confidence interval for b1.

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