The following table shows the number of bacteria colonies present in each of several petri dishes, after
Question:
(a) Create a list of these 20 randomizations (one of which is the original assignment of observations to the two groups) and for each case calculate the control mean minus the soap mean.
(b) How many of the 20 randomizations produce a difference in means at least as large as 4.3?
(c) Is there evidence that the soap inhibits E. coli growth? Justify your answer using the randomization results.
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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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