Scales of Measurement and Types of Studies

A variable that is the proposed cause or difference in the outcome is

• An explanatory or independent variable

• A response or dependent variable

• A confounding variable

• An interacting variable

The outcome variable is:

• The explanatory variable

• The response or dependent variable

• A confounding variable

• An interactive variable

One advantage of a stemplot is:

• Percentages are easily identified

• All values do not need representation

• The shape of the data set may be visualized

A histogram is used for:

• Categorical data

• Continuous data

A pie chart is used for

• Categorical data

• Continuous data

When testing the effect of two medications, the medications would be:

• Nominal variables

• Ordinal variables

• Interval variables

• Ratio variables

Survey scales with a choice of 0-10 are examples of what scale of variable?

• Nominal

• Ordinal

• Interval

• Ratio

Most physiological measure--blood pressure, pulse, cholesterol are what scale?

• Nominal

• Ordinal

• Interval

• Ratio

If the variable has a meaningful zero (meaning absence of the quality) it is

• Nominal

• Ordinal

• Interval

• Ratio

Surveys asking for the participant's perception on a 5 point scale from least likely to most likely are usually

• Nominal scale

• Ordinal scale

• Interval scale

• Ratio scale