certain pen has been designed so that true mean writing lifetime under controlled conditions (involving the use of a writing machine) is at least 10 hours. A random sample of 17 pens is selected, the writing lifetime of each is determined, and a normal probability plot of the resulting data support the use of a one-sample t test. The relevant hypotheses are  H0: μ = 10  versus  Ha: μ < 10.   (a) If  t = −2.1  and  ? = 0.05  is selected, what conclusion is appropriate? RejectFail to reject      (b) If  t = −1.73  and

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