Prolific Academic Survey Alerts

littlewren

olliebean said:

They're trick questions; another one that comes up frequently is, if a bat and a ball cost £1.10, and the bat costs £1 more than the ball, how much does the ball cost? Instinctively it feels like it should cost 10p, but the actual answer is 5p, then the bat costs £1.05 and together they cost £1.10. I think they must be testing whether people are going with the instinctively "obvious" answer, or stopping to think things through first.

Oh man, I had this one too and I put 10p.  Why can't it cost 10p?  Is your study rejected on wrong answers for these?

elsien

littlewren said:

olliebean said:

They're trick questions; another one that comes up frequently is, if a bat and a ball cost £1.10, and the bat costs £1 more than the ball, how much does the ball cost? Instinctively it feels like it should cost 10p, but the actual answer is 5p, then the bat costs £1.05 and together they cost £1.10. I think they must be testing whether people are going with the instinctively "obvious" answer, or stopping to think things through first.

Oh man, I had this one too and I put £1.  Why can't the ball cost 10p?  Is your study rejected on wrong answers for these?

No, studies aren’t rejected for these, don’t worry. It’s a logical thinking thing, that’s all. So if your Covid study is about probabilities (for example) they might chuck in those sorts of questions to see if there’s a correlation between your maths vs the probably incorrect “intuitive” response.
I have a maths a-level but probability makes my brain hurt. As do those puzzles where you have to mentally rotate dice or whatever. 

But they want a selection of answers from a wide selection of the population and I’m their demographic from the flipping useless end of the spectrum.  

elsien

PS I always got the bat and ball one wrong too.
But if your ball costs 10p, and your bat costs £1, although the total is £1.10 the bat is only (£1 - 10p)= 90 p more than the ball.
That had to be pointed out to me as well, btw. 

littlewren

elsien said:

PS I always got the bat and ball one wrong too.
But if your ball costs 10p, and your bat costs £1, although the total is £1.10 the bat is only (£1 - 10p)= 90 p more than the ball.
That had to be pointed out to me as well, btw. 

Ah that makes more sense now you've explained it, so thank you.  Don't like these probability questions though.

olliebean

The one that always hurts my brain is the one about mushrooms in a forest, there's this many red mushrooms and that many white mushrooms and I think there's some yellow mushrooms as well, and some percentage of red mushrooms are poisonous and some different percentages of the other colours, and what's the probability that a poisonous mushroom is red?

elsien

Given the choice, my answer would be I don’t eat mushrooms so I don’t care. 

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