Test an Explanation Built from Sequence
Distinguish timing from evidence that isolates a cause.
Supplied materials
- Original fictional youth-club records: August 1 a new sign was placed outside; weekly entries rose from 30 in the week before to 45 in the week after. On August 1 the club also extended opening time from two afternoons to three. The counter measures entries, including repeat entries, in both weeks.
Learn the idea
A proposed cause should occur before the change it is meant to explain, but being earlier is not enough. When several things change together, the sequence alone cannot tell us how much each contributed. Identify other changes before accepting a claim that one event caused the entire difference.
The entries increased by fifteen while both a sign and an additional afternoon were introduced. The measurement is consistent here, but the available opening time changed. The sign might have helped, the extra afternoon might have helped, or both might matter. The records show an association and plausible explanations; they do not assign an exact causal share.
- Calculate the entry-count change.
- List both changes introduced August 1.
- Write a claim using “possible contributor” rather than “entire cause.”
- Describe additional comparison records that could help distinguish explanations, without treating them as already available.
See the method in action
“Entries rose 45−30=15. The sign is a possible contributor, but the extra opening afternoon is another. Comparing consistently measured weeks when opening time stayed fixed could help evaluate the sign, though other changes would still need checking.”
Check your reasoning
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See the answer and explanation
Entries rose by fifteen alongside a sign and an extra opening afternoon; their separate effects remain unknown.
The count is entries, and two changes occurred together. The records do not isolate a sign effect or count unique people.
Take it further
Changed input: opening time stayed at two afternoons, but a new art workshop began in the second week. Model reasoning: “The extra-afternoon explanation is removed, but the workshop is now another possible contributor. Unchanged hours alone would still not isolate the sign’s effect.”
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