Mathematics, 09.12.2021 01:00, wolffee895

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. Using the 95% confidence interval (from question 37) is it plausible that the mean time the highlighters last is exactly 14 hours?
A.
Yes, because 14 was not in the interval.
B.
No, because 14 was in the interval.
C.
Yes, because 14 was in the interval.
D.
No, because 14 is not in the interval.
E.
None of the above

Answers: 1

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A manufacturer claims that their highlighters could write continuously for 14 hours. A researcher wa...