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1. In the analysis of variance F test, why is it that only the area in the upper tail of the F distribution is of interest?
2. With reference to Table E in Appendix D, what tabulated value of F is so great that it would be exceeded in random sampling only 5% of the time when there are
(a) 5 degrees of freedom in the numerator and 20 in the denominator?
(b) 20 degrees of freedom in the numerator and 5 in the denominator?
(c) 3 degrees of freedom in the numerator and 40 in the denominator?
(d) 6 degrees of freedom in the numerator and 100 in the denominator?
Pearson correlation of r = +0.85 indicates that a graph of the data would show ___. Clustered close to a line that slopes up to the right points clustered close to a line that slopes down.
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a manufacturer receives parts from two suppliers. a simple random sample of 400 parts from supplier 1 finds 20
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