Question: =+20. A certain pen has been designed so that true average writing lifetime under controlled conditions (involving the use of a writing machine) is at

=+20. A certain pen has been designed so that true average writing lifetime under controlled conditions

(involving the use of a writing machine) is at least 10 hours. A random sample of 18 pens is selected, the writing lifetime of each is determined, and a normal quantile plot of the resulting data supports the use of a one-sample t test.

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