Selenium (Se) is an essential element that has been shown to play an important role in protecting
Question:
(a) Can we regard the sample correlation between Tooth (Y) and Liver (X) selenium, r = 0.53726, as an estimate of the population correlation coefficient? Briefly explain.
(b) If the circled point were removed from the data set, would the sample correlation listed in part (a) increase, decrease, or stay about the same?
(c) If the roles of X and Y were reversed (i.e., Y = Liver and X = Tooth selenium), would the sample correlation listed in part (a) increase, decrease, or stay about the same?
(d) Is the circled point on the plot a leverage and/or influential point? Explain briefly.
(e) Is the circled point on the plot an outlier?
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Related Book For
Statistics For The Life Sciences
ISBN: 9780321989581
5th Edition
Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner
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