Weekly Challenge
Five original questions for the week of October 12, 2026. No timer. Check each answer as you go.
Students who take notes by hand remember lectures better than students who type notes, so handwriting notes causes better memory.
Which of the following, if true, most weakens the causal claim?
If hand-writers also review more, the review habit, not the handwriting, may explain the better memory. Alternative cause again.
Every novel on the bestseller list this week is a mystery. "The Silent Room" is on the bestseller list this week.
What must be true?
Universal claim plus membership gives the conclusion directly. The book is on the list, and everything on the list is a mystery.
The dam will hold through the storm. It held through a worse storm last year, and it has been reinforced since.
Which assumption makes the conclusion follow logically?
B supplies the exact rule that turns the two facts into a guaranteed conclusion. The others only add plausibility.
Ruth: "We should require helmets for bike-share riders, since head injuries are the main risk in bike crashes." Sam: "Helmet rules would cut ridership in half, and fewer riders means the program fails. We should skip the requirement."
Ruth and Sam disagree about whether
Ruth wants the requirement; Sam opposes it. That is the direct disagreement. Sam never disputes the injury claim (A).
This diet book has sold two million copies, so its advice must be sound.
The reasoning is vulnerable because it
Sales measure marketing and appeal, not truth. Millions of people can buy bad advice. This is an appeal to popularity.
A free diagnostic shows your starting score, then a study plan tells you what to work on next.
Last updated October 12, 2026