Shot peening is used to compress the surface area of metal parts to make them more resistant to fractures. It is done by bombarding the surface with small particles hurled at high velocity. Each time a particle hits, it puts a small dent in the surface and compresses the area directly beneath the surface. The bombardment continues until eventually the entire surface is compressed. Tests are conducted on a particular part to see if shot peening reduces the proportion of parts that fractice when put into use. These data result:
Not shot peened: n1 = 35 and number fractured = 7.
Shot peened: n2 = 40 and number fracture = 3.
Set up the appropriate null and alternative hypotheses. based on these data, do you think that shot peening reduces the probability that a part will fracture when put into use? Explain based on the P value of the test.
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