You are assigned to inspect metal-composite beam trusses for a new bridge being built over a nearby lake. The manufacturer has run a prototype set of 500 beams and conducted strength tests, which you consider to be the baseline case, shown by the solid line in all graphs. Examine the graphs, and explain the changes to the baseline curve observed in the dashed line by choosing a cause from the following list. The strength of the beam is shown on the abscissa.
a. The manufacturer tested 1000 beams instead of 500 beams
b. A reinforcing coating was used on a sample of 500 beams.
c. The manufacturer upgraded processing equipment to lower the variability of the metal-composite strength.
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