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For clarity, how many bars or classes do many histograms use?
ABetween two and four bars
BBetween 20 and 30 bars
CBetween five and 15 bars
DBetween 30 and 50 bars
Answer & Solution
Correct answer: C. Between five and 15 bars
1. Too few bars hide the shape of the data and too many break it into noise.
2. The working range given for clarity is five to 15 bars or classes.
3. Two to four bars would flatten almost any distribution into a block.
4. Twenty bars and above start to reproduce the raw listing rather than summarise it.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 2 "Descriptive Statistics", section 2.1 Display Data_
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