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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 = -2.5,and α = .05?

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The Answer of The Next Questions Are Based On The Following Information: 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 = -2.5,and α = .05?

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