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Hormone study (Chapter 6)

As part of a larger cattle study, the effect of two types of feed on the concentration of a certain hormone was investigated. Twenty cows were given the feed for a period, and the hormone concentration was measured initially and at the end of the period.
A data frame with 9 observations on the following 3 variables.
  1. initial :a numeric vector
  2. final :a numeric vector
  3. difference :a numeric vector

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