Question

A researcher is interested in the mean mileage for all school buses in a school district. Forty buses are randomly selected from a computer printout that contains every bus in the district. For each bus they record the name of the school it is used for, mileage, and age. It is calculated that 32.5% of the 40 buses are over 15 years old. With 99% confidence they find that the mean mileage for all school buses in the school district is between 85,261 and 134,890 miles.What is the qualitative variable in this study

Answer 1

Using classification of variables, it is found that the qualitative variable in this study is the name of the school the bus is used for.

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Variables may be classified as quantitative or qualitative.

• A variable is quantitative if it assumes numerical values, for example 1,2,3.  

• If it assumes "labels", for example good or bad, it is qualitative.

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In this question, the variables are:

• School name, which is qualitative.
• Mileage, which is quantitative.
• Age, which is quantitative.

Thus, the qualitative variable is the school name.

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