What are the categories into which a continuous data scale can be divided to summarize frequencies called?

• A. Class intervals
• B. Coding
• C. Frequency data
• D. Interquartile range

Answer: (A)

Class intervals are the ranges used to split a continuous data scale when summarizing frequencies. By grouping values into equal-width intervals, you create a frequency distribution that shows how many observations fall into each range, making the overall shape and patterns in the data easier to see. Each interval covers a continuous span of values, and the count in that interval reflects how many data points lie there. This approach helps manage large data sets and reveal where most values cluster. The other terms describe different ideas: coding is about assigning codes to data, frequency data refers to the counts themselves, and the interquartile range is a spread measure between the 25th and 75th percentiles, not a method for dividing data into categories for frequencies.