Data for Exercise 8.21
A data frame/tibble with 2,484 observations on two variables
factor with levels
nearly every night, and
snores every night
factor indicating whether the indiviudal has heart disease
Norton, P. and Dunn, E. (1985), Snoring as a Risk Factor for Disease, British Medical Journal, 291, 630-632.
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
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