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(Choose 1 answer)
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☐ A
A. Test statistic t = -1.263. There is
☐ E
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sufficient evidence to support the claim
that the mean is less than 30g.
B. Test statistic t = -1.263. There is not
sufficient evidence to support the claim
that the mean is less than 30g.
C. Test statistic t = -1.463. There is
sufficient evidence to support the claim
that the mean is less than 30g.
D. None of the other choices is correct
E. Test statistic t = -1.463. There is not
sufficient evidence to support the claim
that the mean is less than 30g.
A manufacturer makes ball bearings that are supposed to have a
mean weight of 30g. A retailer suspects that the mean weight is
actually less than 30g. The mean weight for a random sample of
16 ball bearings is 28.8g with a standard deviation of 3.8g. At the
0.05 significance level, test the claim that the mean is less than
30g. Assume that the sample has been randomly selected from a
population with a normal distribution.
Let to.05.15 1.75, t0.025.15 = 2.13
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