Mathematics, 16.12.2019 19:31 angel234wilcox
Durco 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
multiple choice
a. −1.980
b. −2.101
c. −1.960
d. −1.728
Answers: 2
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Durco manufacturing claims that its alkaline batteries last at least 40 hours on average in a certai...
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