A manufacturer claims that their highlighters could write continuously for 14 hours. A researcher wanted to find out if the highlighters would last longer than 14 hours. The researcher tested 40 highlighters and recorded the number of continuous hours each highlighter wrote before drying up. The mean was 14.5 hours and the standard deviaton was 1.2 hours. With a significance level of 5%, test the hypothesis that the mean writing time for the highlighters is more than 14 continuous hours.
Find the test statistic (Round all values to three decimal places.)
A.
z2.635
B.
t9.583
C.
t2.635
D.
z9.583
E.
None of the above

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