Contrib/Piedmont/StevensStatistics/9-HypothesisTestingTwoSamples/9.1.2.pg

[dlglin]

Problem Seed: 1133

With this seed the @d array is all zeros, which means that $s is 0, so the calculation of $t leads to a division by zero error.

I see two ways to fix this:

1. If you want to allow a data set where the left and right are always identical, then add a conditional that sets $t=0 if $s==0, skipping the more general calculation of $t.
2. Beef up the do... until loop to skip cases where $s==0, which would mean a student would never get a case when the standard deviation is 0.

Tagging @d-torrance since this is a Piedmont Contrib problem.

[d-torrance]

Thanks for catching this! Fixed in #1429 using option 2