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Research and development has designed a ball point pen so that the true average writing lifetime under controlled conditions (involving the use of a writing machine)is at least 12 hours.A random sample of 18 pens is selected,the writing lifetime of each is determined,and a normal probability plot of the resulting data supports the use of a one-sample t test.
-What conclusion is appropriate for the hypotheses H0 : μ = 12 against H1 : μ < 12,and the test statistic t = -2,and α = .01?
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-2.0 is not <-t17,0.01 = -2.567,so we ...View Answer
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