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2 cards from this section. Quick, good the night before a test.
What is the class mark of the interval 20 - 30?
It's the average of the two limits.
Why do we group data?
Think about managing large datasets.
What is the class mark of a class interval 30-40?
Use (Lower + Upper) / 2 formula.
The Step-Deviation Method uses what to simplify calculations?
What role does class size play in this method?
Given class intervals 0-10, 10-20, and their respective frequencies 5, 10. Calculate mean using Direct Method.
Remember to find each interval’s class mark.
How does the choice of assumed mean affect the accuracy of calculations in grouped data?
Analyze the data to select an ideal assumed mean.
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