Explanation 1
Nominal: account type or country.
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Lesson 4 of 12
Use nominal, ordinal, interval, and ratio levels to decide which comparisons and calculations are meaningful.
Theory
Nominal variables are names without rank. Ordinal variables have rank, but unequal or unknown gaps. Interval variables have meaningful equal differences but no true zero. Ratio variables have equal differences and a true zero, so ratios can be interpreted.
Explanation 1
Nominal: account type or country.
Explanation 2
Ordinal: satisfaction rank.
Explanation 3
Ratio: study hours or response time.
Interactive Mission
Current level
nominal
Count categories. Measurement level helps decide which summaries are defensible.
R connection
Use ordered factors to encode rating data and summarize ordered categories carefully.
Live R Lab
Encode ordered survey ratings, summarize their distribution, and discuss when a mean is only a rough shorthand.
Ready to run
Can I average this?
Averages are strongest for interval or ratio data. For ordinal ratings, a mean can be a shorthand, but the distribution should be shown too.
Assistant
Give me a measurement-level decision tree for a variable I describe, without directly answering any active quiz question.
Exit check
Use the hint button if you need coaching before answering. Explanations appear after you check or submit.
Checkpoint
Question 1 of 2. Answered 0/2. Passing score: 70%.