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Quality Quiz from Professor Cleary
Congratulations:
"D" is correct.
Click here for a more complete video explanation
There are four types of data:
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1. |
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. |
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| 2. |
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. |
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| 3. |
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 |
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| 4. |
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.
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