The producer of a certain medicine claims that their bottling equipment is very accurate and that the standard deviation of all their filled bottles is .2 ounces or less. A sample of 20 bottles showed a standard deviation of .12 ounces. The test statistic to test the claim is
A. 2.3.
B. 22.99.
C. 6.84.
D. 1.368.
Answer: C
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