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Which of the following does the monitoring of X's in X-barR chart show? A Centering B Dispersion C Sigma D Standard deviation #79 A sample

Which of the following does the monitoring of X's in X-barR chart show?

A	Centering
B	Dispersion
C	Sigma
D	Standard deviation

#79

A sample size of 28 was used to test a two-tail hypothesis about a population mean. Which is the confidence level of the hypothesis test for a known critical value of t = 2.052? Caution: Think it through.

A	95%
B	97.5%
C	99%
D	90%

#81

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