Mathematics, 12.11.2020 09:20 wwesuplexcity28
Statistic ~ Find the critical value
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 28.6g with a standard deviation of 4.4g. At the 0.05 significance level, test the claim that the sample comes from a population with a mean weight less than 30g.
I did df = n - 1 = 16 - 1 = 15
invT (1 - 0.05, 15) = 1.753 but is wrong
What's the answer?
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Statistic ~ Find the critical value
A manufacturer makes ball bearings that are supposed to have a...
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