Keep a Rate and Its Denominator Visible
Divide completed attempts by all supplied attempts and state the denominator.
About 22 minutes, plus any extended practice
Supplied materials
- Paper and pencil; answers may also be spoken or typed.
- All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.
Learn the idea
A percentage is a numerator divided by a specified denominator. Different denominators answer different questions. A completed-attempt rate is not the same as a unique-person success rate. Our supplied quantities represent attempts only, and no causal inference is established by calculating a rate.
Divide completed attempts by all supplied attempts and state the denominator. Do not call an attempt rate a people rate.
Use this supplied case: Fictional log has 6 completed attempts among 8 total attempts. Attempt completion percentage? The task is to connect the given information to the computing idea. Write a short evidence trail so another learner can reproduce your choice. The simplified case describes the stated model, not every real system.
- Represent the supplied worked case with a labeled drawing, table or short trace.
- Divide completed attempts by all supplied attempts and state the denominator.
- Explain why the worked answer fits and why one alternative does not.
- Try the new check and practice cases; revisit the stated rule if your evidence does not match.
See the method in action
Fictional log has 6 completed attempts among 8 total attempts. Attempt completion percentage? The supported answer is 75%. Applying the stated rule gives 75%. Divide completed attempts by all supplied attempts and state the denominator. Do not call an attempt rate a people rate. A percentage is a numerator divided by a specified denominator. Calculation: ((100*6)/8) = 75.0.
Check your reasoning
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Helpful tips
- Divide completed attempts by all supplied attempts and state the denominator.
- Do not call an attempt rate a people rate.
See the answer and explanation
70%
Using the supplied inputs: ((100*7)/10) = 70.0. Divide completed attempts by all supplied attempts and state the denominator. Do not call an attempt rate a people rate.
Take it further
New log:21 completed attempts of 30. Expected:70%attempt completion. Unique people counts remain unknown unless supplied separately.
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More practice: try new cases
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