A contact lens manufacturer is considering replacing its polisher. He requires that the new polisher, which is very expensive, produce less than 8% of lenses with surface defects, otherwise he will keep the current polisher. He will use a significance level of 2.5%.

a) Tick the box corresponding to the hypotheses tested:

OL Hop = 0.08 Hip = 0.08 Di Hop = 0.08 Hip = 0.08 Oil. Hop = 0.08 Hip