Prolific Academic Survey Alerts

olliebean

Health-related survey (desktop only)

Hosted by stern.nyu.edu

£0.30 14 minutes £4.61/hr 265 places remaining

I don't think much of Prolific's maths here. 30p for 14 minutes is certainly not equivalent to £4.61 per hour.

littlegreenant

Vaccination survey

Hosted by bristol.ac.uk

£0.40 2 minutes £9.12/hr 331 places remaining

littlegreenant

Classroom behavior impressions

Hosted by SCABL LAB

£1.48 15 minutes £5.89/hr 1891 places remaining

Ivana_B_Rich

Understanding COVID-related behaviors - Follow-up

Hosted by udel.edu

£7.5434 minutes £13.30/hr 133 places remaining

littlewren

Two studies running I've had questions (different each time) about random things like if a dice is thrown how many times will it come up with an even number.... and how many lily pads will it take to cover a pond etc.  They're driving me nuts, I don't know them, even though I try to work them out and I don't know why they ask.  Does anyone know?

JGB1955

littlewren said:

Two studies running I've had questions (different each time) about random things like if a dice is thrown how many times will it come up with an even number.... and how many lily pads will it take to cover a pond etc.  They're driving me nuts, I don't know them, even though I try to work them out and I don't know why they ask.  Does anyone know?

My guess is that they're trying to work out how logical your answers are... i.e. if a dice is thrown x number of times an even number should turn up 50% of the time... etc etc

I like the ones where, at the end, they ask if I know what the survey is trying to establish/discover...my answer tends to be 'haven't a ********* clue'!

MollyR

If a lily pad doubles in size each day, and by the 50th day it has covered the pond, then on the 49th day it must have covered half the pond.  This works for any number of days.  If a single die is thrown repeatedly, it should come up with an even number 50% of the time.  If two dice are thrown together, it sounds as though it should be more complicated, but since the odds are 50% for each die to come up even, the odds are also 50% that the total of both dice should come up even.  Hope this helps!

littlewren

MollyR said:

If a lily pad doubles in size each day, and by the 50th day it has covered the pond, then on the 49th day it must have covered half the pond.  This works for any number of days.  If a single die is thrown repeatedly, it should come up with an even number 50% of the time.  If two dice are thrown together, it sounds as though it should be more complicated, but since the odds are 50% for each die to come up even, the odds are also 50% that the total of both dice should come up even.  Hope this helps!

Thank you, I must be thick, I still don't get the lily pad one!  I was completing a study about Covid and suddenly these questions came up, I thought oh no, not again, although they were different to the ones in the previous study..........

MollyR

If it doubles every day, then the previous day it must always have been half the size it is now.  It doesn't matter how big the pond is, or how big the lily pad is;  it's just the logic that the day before it covers the whole pond, it must have covered half the pond.  The day before that, it would have covered a quarter of the pond, and the day before that it would have covered an eighth...

olliebean

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.