1. For quality control purposes the manufacturer of NFL footballs wishes to estimate the mean inflation pressure to be within E=.015 lb of its true value with a 80% confidence interval. What sample size should be specified for the experiment? Use std. deviation = .1 a) 106 b)107 c)40 d)100 e)74 2) Find Z.2 a) -.84 b) .84 c) .52 d) -1.28 e)none of the above 3) if Is known from past ten years that the average IQ of Commack elementary students is at least 110. The principal thinks that this is an overestimate and the average is less than 110. The principal administers an IQ test to 20 randomly students. Among the sampled students the average IQ is 104 with a standard deviation of 10. Assume a significance level of 0.05 and conduct a hypothesis test. Start the critical value(s) for this test