CHAPTER 14
Relationships with Numerical Data
It is frequently required to compare two or more sets of data to decide whether they are related in some way. Some quantities are related because we have defined them to be so. Kilometers are related to miles in a precise way and the relationship can be expressed as a formula:
kilometers = miles x 1.609.
Dollars are related to pounds sterling by a precise rate of exchange, which may vary from day to day and place to place, but which is nevertheless precise for a particular transaction. Generally, however, we are dealing with quantities which may show some relationship but rarely a precise relationship.
Scientific investigations under closely controlled ...
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