In a random sample of 100 automobile engine crankshaft bearings, 15 have surface finish roughness that exceeds specifications. Does this data present sufficient evidence that proportion of crankshaft bearings exhibiting excess surface roughness is greater than 0.1?
a. State and test appropriate hypothesis using?=0.05
b. If p=0.2, how large would the sample size have to be for us to a probability of correctly rejecting the null hypothesis of 0.8.