Text input boxes with multiple correct answers only going green for first option

[ElliotMillington]

A student in one of my support sessions came to me with problems on activity 9 of chapter 16. She was entering "0.22" for the question on minimum effect size, but the box was telling her it was wrong.

I did some digging and found that the fitb function accepts ".22", even though "0.22" is listed as an argument. Sorry, I'm not familiar with the function, so I don't know how to fix it!