The diameter in millimeters for a random sample of 15 diodes from each of the two suppliers is stored in the data frame
A data frame with 30 observations on the following 2 variables:
diameter (diameter of diode measured in millimeters)
supplier (factor with levels
Ugarte, M. D., Militino, A. F., and Arnholt, A. T. 2015. Probability and Statistics with R, Second Edition. Chapman & Hall / CRC.
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