Mathematics, 23.11.2019 05:31 jrjordans13ox06qs
Dullco manufacturing claims that its alkaline batteries last at least 40 hours on average in a certain type of portable cd player. but tests on a random sample of 18 batteries from a day's large production run showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. to test dullco's hypothesis, the test statistic is:
select one:
a. -2.101
b. -1.980
c. -1.960
d. -1.728
Answers: 2
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Dullco manufacturing claims that its alkaline batteries last at least 40 hours on average in a certa...
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