The correct answer is “D”
There are four types of data:
- Nominal data. The word ‘nominal ‘ comes from a Latin word, meaning ‘name. ‘ Nominal data allows for distinctions to be made between items, such as male or female; programmer or nonprogrammer; rainy or not rainy.
- Ordinal data. The word ordinal comes from another Latin word, meaning ‘order. ‘ Ordinal data identifies distinctions among items with respect to degree or order: e.g., small, medium, large; short, tall; or big, little.
- Interval data. Interval data reflects a measurement of the difference between items.
$2,400 and $2,200 = difference $200
6 feet and 5 feet = one foot difference
10 days and 2 days = eight days difference
- Ratio data. Distinguishes among items using a common denominator, that is, percentage.My day class is 50 percent female.
My evening class is 30 percent female.
30 percent of part A are bad
20 percent of part B are bad
Raney has ratio (commonly known in SPC as attributes) data, rather than interval data. A p-chart or an np-chart would be appropriate to use in this case. Note: Under some circumstances, some would suggest that an X-MR chart is the right choice here.