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Question
In testing the difference between the means of two normally distributed populations, if 
1 = 2 = 50, n1 = 9, and n2 = 13, the degrees of freedom for the t statistic equals ___________.
A. 22
B. 21
C. 19
D. 20
Answer
This answer is hidden. It contains 2 characters.
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Q:
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Control charts are used to reduce common causes of variation.
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An chart is a control chart on which individual process measurements are plotted versus time.
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