Data conclusions
Read the records, then separate what must be true from what could be true.
Continue your unfinished round
Your answers are saved in this tab. Continue from where you left off.
Continuing uses no additional practice start.
Discard the unfinished round?
Your answers from this round will be discarded. You can choose your settings before starting a new round.
Starting the new round uses one practice start.
Compare success rates with unequal attempt totals
Your last settings are ready. Change them whenever you like.
6 questions · No time limit
Example
Example
Example · Standard
Claim: Group B has a higher success rate than Group E.
| Group | Successes | Attempts |
|---|---|---|
| B | 25 to 29 | 50 |
| E | 43 to 47 | 70 |
Total successes across both groups: 72.
- Questions answered
- 0 / 6
- Active time
- 0:00
Ready to start?
Judge the claim using only the displayed records. Choose Supported, Contradicted, or Cannot determine.
This practice could not continue. Reload the page to try again.
Reload pageOptional and off by default. Share starts, completions, replays and error categories. For visits from ChatGPT, starts and completions can also include the first QuickenBrain page and broad country. No answers, drawings or names.
How this data is usedHelp
Every count is a whole number, and a range includes both endpoints. Supported means the claim holds in every dataset consistent with the records. Contradicted means it holds in none of them. Cannot determine means at least one consistent dataset makes it true and another makes it false. All displayed totals apply at the same time. These are original reasoning exercises, not an intelligence assessment.
Each round has six questions and no time limit. Choosing an answer locks it. Review the steps, then move to the next question. Finish all six to save the round. Active time includes reviewing the steps, but does not count time when this page is hidden. Speed does not affect your score.
Use Tab and Enter or Space to choose an answer. The number keys also select answers, except when another control is focused. After an answer, Enter goes to the next question.
Original practice puzzles, not a standardized assessment.
About this practice
Learn a method
Check what the data proveRead the records, then separate what must be true from what could be true.
Report a problem
Optional and off by default. Share starts, completions, replays and error categories. For visits from ChatGPT, starts and completions can also include the first QuickenBrain page and broad country. No answers, drawings or names.
How this data is used