[CS-FSLUG] Cognitive Reflection Test

[Ed Hurst]

Spoiler Warning!

Correct answers inline below.








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Christopher Rose wrote:

>>(1) A bat and a ball cost $1.10 in total. The bat costs a dollar 
>>more than the ball. How much does the ball cost? The ball costs $0.10

No. The ball costs $.05. That bat is $1.05.

>>(2) If it takes 5 machines 5 minutes to make 5 widgets, how long 
>>would it take 100 machines to make 100 widgets? It would still take five minutes.

Correct. Machine number is immaterial to the individual rater of 
production, which is fixed.

>>(3) In a lake, there is a patch of lilypads. Every day, the patch 
>>doubles in size. If it takes 48 days for the patch to cover the 
>>entire lake, how long would it take for the patch to cover half of 
>>the lake? To cover half the lake takes 47 days.

Correct. The question hinges on understanding the concept of half-life 
and exponential growth.

-- 
Ed Hurst
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