Question

Engineers are designing a new airplane. They want to select the strongest available bolts to use on the wings of the plane. They conduct stress tests of two different bolts, to find out how frequently each bolt breaks (its breakage rate). In equivalent stress tests, one bolt breaks at a slightly lower rate than the other, but after analyzing many bolts, the engineers find that the difference is barely significant (with a P-value of 0.07).

A. The bolt with a lower breakage rate is stronger, but costs a little more money. Given that the difference between it and the cheaper bolt is not very significant, should we use the weaker bolt? Explain.

B. Is the difference between the bolts significant in a real-world sense? Explain your answer.

Answer 1