Ratio the data set's level of measurement. number of milligrams of tar in 30 cigarettes.
To measure a particular data set, use a nominal scale to obtain categorical data and an ordinal scale to obtain ordered or ranked data. Interval scales are used to capture data that can be measured on a Likert scale, while ratio scales are used to capture data containing real or fractional numbers. Given the question, the number of milligrams of tar in 85 cigarettes can be fractional or real, so a ratio scale is used to measure the same.
The four lowest to highest data measurement levels are nominal, ordinal, interval, and ratio.
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