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Quizzes > Mathematics

Nominal Ordinal Interval Ratio Quiz: Check Your Skills

Quick, free levels of measurement quiz. Instant results.

Editorial: Review CompletedCreated By: David WalshUpdated Aug 23, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for quiz on ordinal, nominal, interval, ratio scales knowledge test on teal background

This quiz helps you identify nominal, ordinal, interval, and ratio scales in everyday data. Practice quick classifications, see why each answer fits, and build speed for exams or projects. For more practice, try our research methods quiz, explore tools with the weather instruments quiz, or broaden your base with a basic science quiz.

Which of the following is an example of a nominal scale?
Temperature in Celsius
Hair color (e.g., brown, blonde, black)
Olympic medal placements (gold, silver, bronze)
Height in centimeters
A nominal scale categorizes data without any meaningful order or numeric value. Hair color fits because it simply labels categories. There is no inherent ranking or measurable distance between categories. .
Which level of measurement has categories with a clear, meaningful order but unequal intervals between categories?
Ordinal
Interval
Nominal
Ratio
An ordinal scale provides a rank order of categories where differences between ranks are not necessarily equal. You know which category is higher or lower but cannot quantify the exact distance. Race finishing positions and Likert scales are common examples. .
Which of the following is an example of an interval scale?
Gender categories
Number of students in a class
Temperature in Celsius
Shoe size
An interval scale has equal intervals between values but an arbitrary zero point. Temperature in Celsius is classic: a 10° difference equals another 10° difference, but 0° does not mean 'no temperature'. You cannot form true ratios with interval data. .
Which measurement scale allows for a true zero point and meaningful ratios between values?
Nominal
Ratio
Interval
Ordinal
A ratio scale features both equal intervals and a non-arbitrary zero indicating absence of the measured attribute. This allows statements like 'twice as much' to be meaningful. Examples include height, weight, and duration. .
Why can't you say that 20°C is twice as hot as 10°C?
Because Celsius is an interval scale without a true zero point
Because temperature is a ratio-scale measurement
Because Celsius data are nominal
Because intervals in Celsius are not equal
Celsius is an interval scale: zero does not represent an absence of temperature, but is arbitrarily set. While differences are equal, one cannot compute meaningful ratios. Thus 20°C is not twice as hot as 10°C. .
Shoe sizes are an example of which level of measurement?
Ordinal
Ratio
Interval
Nominal
Shoe sizes indicate order - bigger numbers mean larger shoes - but the intervals between sizes are not necessarily equal in length. They do not have a true zero point in a meaningful sense. This makes shoe sizes ordinal. .
A 5-point Likert scale (1=strongly disagree to 5=strongly agree) is an example of what measurement scale?
Ordinal
Interval
Nominal
Ratio
Likert scales rank attitudes in order, but the spacing between points is not guaranteed to be equal. Thus they are ordinal: you know more agreement versus less, but not how much more. Researchers should be cautious when applying parametric tests to Likert data. .
What measure of central tendency is most appropriate for nominal data?
Mode
Standard deviation
Mean
Median
The mode identifies the most frequently occurring category, which is the only meaningful central tendency for nominal data. Mean and median require ordering or interval information. Standard deviation is a measure of spread, not central tendency. .
IQ scores, which have equal intervals but no true zero, are measured on which scale?
Ordinal
Nominal
Interval
Ratio
IQ scores have an arbitrary zero and equal-interval properties - one cannot say someone with IQ 140 is twice as intelligent as someone with IQ 70. They qualify as interval data. .
Which statistical operation can you perform on ratio-level data but not on interval-level data?
Calculate geometric mean
Use mode
Rank data
Compute median
The geometric mean requires a true zero point for meaningful interpretation. Ratio scales permit meaningful products and ratios, while interval scales only support differences. Median, mode, and ranking do not require ratio-level data. .
Which measure of central tendency is least appropriate for ordinal data?
Mean
Mode
Median
Range
Ordinal data indicate order but not equal distances, so you cannot calculate a meaningful mean. Median and mode are appropriate because they rely on ordering or frequency, and range measures dispersion, not central tendency. .
Which type of graph is most suitable for displaying the distribution of interval or ratio data?
Pie chart
Bar chart
Histogram
Scatterplot
Histograms show frequency distributions of continuous data arranged in equal-interval bins. They are ideal for interval or ratio scales. Pie charts and bar charts are typically for categorical data, and scatterplots show relationships between two variables. .
Converting temperature from Kelvin to Celsius by subtracting 273.15 illustrates which property of interval scales?
Preserving equal intervals under an additive shift
Order without equal spacing
Categorical classification
Maintaining ratios upon multiplication
An interval scale allows you to add or subtract a constant without affecting the equal spacing between values. Converting Kelvin to Celsius is a shift (K - 273.15), preserving interval properties. Ratio properties are lost because zero changes meaning. .
Reaction time measured in seconds is an example of which level of measurement?
Interval
Ratio
Ordinal
Nominal
Reaction time has equal intervals and a true zero point (no reaction time). You can say someone took twice as long to react. These features define a ratio scale. .
Calendar years (e.g., 1990, 2000, 2010) represent what level of measurement?
Interval
Nominal
Ratio
Ordinal
Years have equal intervals (a decade is always ten years) but lack a true zero reference point. The year '0' is arbitrary in most calendars, making this an interval scale. .
Converting raw scores to percentile ranks produces data at what level of measurement?
Ratio
Ordinal
Nominal
Interval
Percentile ranks rank individuals without preserving equal intervals; they tell you who is above or below but not by how much. Thus they form an ordinal scale. .
Birth years (e.g., 1985, 1990, 1995) are an example of which measurement scale?
Ratio
Ordinal
Nominal
Interval
Birth years have meaningful distances (years between dates) but no absolute zero that indicates absence of years. Thus they are interval data - differences are interpretable, but ratios are not. .
A pain rating scale from 0 (no pain) to 10 (worst pain) is typically considered what level of measurement?
Ordinal
Ratio
Interval
Nominal
Although the scale uses numbers and a zero point, the subjective differences between ratings are not guaranteed equal. We know only that higher scores indicate more pain, making it ordinal. .
The Pearson correlation coefficient requires at least what level of measurement for both variables?
Ordinal
Nominal
Interval
Ratio
Pearson's r assumes equal intervals and normally distributed continuous data, which implies interval or ratio scales. Interval is the minimum level required since ratio is a subtype. .
Which transformation can convert an interval scale into a ratio scale?
No transformation can convert interval to ratio
Take the logarithm
Subtract the minimum value
Divide by the range
Interval scales lack a true zero point by definition; no mathematical transformation can introduce an absolute zero. Therefore, an interval scale cannot become a ratio scale. .
A socioeconomic status (SES) index created by summing ranked education levels, income brackets, and occupation ranks results in what level of measurement?
Ratio
Nominal
Ordinal
Interval
Summing ranks from different variables retains only the order among individuals; the summed score does not guarantee equal intervals. Thus the composite SES index is ordinal. .
If you add a constant value to every observation in a ratio-scale dataset, the resulting data become what level of measurement?
Ordinal
Ratio
Nominal
Interval
Adding a constant destroys the true zero point of ratio data, making only differences meaningful. The new scale has equal intervals but an arbitrary zero, characteristic of an interval scale. .
Which measure of dispersion is appropriate only for interval and ratio scales?
Mode
Range
Standard deviation
Median absolute deviation
Standard deviation relies on meaningful distances and arithmetic operations that require equal-interval (or ratio) properties. Range can be used on ordinal, and median absolute deviation can be applied to ordinal and higher. .
Multiplying two interval-level variables produces a variable that is measured on which level?
Ordinal
Ratio
Interval
None of the above
Interval-level data have no true zero, so products do not yield interpretable intervals or ratios. The result does not meet nominal properties either, therefore it fits none of the standard levels without further justification. .
Which of the following data transformations preserves the ordinal nature of a variable but not its interval properties?
Converting raw scores to ranks
Applying a logarithm
Subtracting a constant
Multiplying by a positive constant
Converting data to ranks maintains the order of observations but ignores original distances, destroying interval information. Adding or multiplying preserves interval or ratio properties, and logarithms maintain interval if applied to ratio data. .
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Study Outcomes

  1. Understand the four measurement scales -

    Define and describe nominal, ordinal, interval, and ratio levels of measurement in statistics.

  2. Identify levels of measurement examples -

    Recognize nominal level of measurement examples and distinguish them from interval and ratio scenarios.

  3. Differentiate among scales -

    Apply clear criteria to classify variables into the ordinal nominal interval ratio framework.

  4. Analyze quiz scenarios -

    Evaluate sample questions to determine which level of measurement each represents and spot any invalid options.

  5. Apply knowledge in practice -

    Use your understanding to answer challenging quiz questions and reinforce your grasp of statistics levels of measurement.

Cheat Sheet

  1. Nominal Scale Essentials -

    Nominal measurement classifies data into distinct categories without any inherent order, such as gender or hair color. It's foundational in surveys and categorical analyses because you only count frequencies or use the mode as a measure of central tendency (OpenStax Statistics). Remember "name only" to recall it's all about labels, not quantities.

  2. Ordinal Scale Ordering -

    Ordinal data provide a rank order - think customer satisfaction ratings or class standings - where distances between ranks aren't equal (University of California, Berkeley). You can determine which is higher or lower but can't compute meaningful differences like you would with interval data. A handy trick: "order first, measure later."

  3. Interval Scale Insights -

    Interval scales feature equal intervals between values but lack a true zero point, examples include Celsius or Fahrenheit temperatures (National Weather Service). You can add and subtract values, but ratios don't make sense - 20°C is not twice as hot as 10°C. Recall "intervals intact, zero abstract."

  4. Ratio Scale Advantages -

    Ratio scales have all the properties of interval scales plus an absolute zero, so you can add, subtract, multiply, and divide (Statistics Canada). Common examples are weight, height, and time measured from a true zero start. Think "ratio's real zero" to lock in that meaningful absence point.

  5. Mnemonic NOIR for Levels -

    Use the acronym "NOIR" (Nominal, Ordinal, Interval, Ratio) as a memory aid, borrowed from classic statistics pedagogy (American Psychological Association). Placing the four levels in ascending order highlights increasing mathematical operations. Picture a painter's palette labeled NOIR to keep it vivid and memorable.

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