On the form below, you can put this all together. As you fill out each column, click on the button below it

to check your numbers. BTW, this is where having a calculator will come in handy. As long as you use 2

significant digits in your calculations, the program will fill in additional digits for you.

Once again, recall that there were 42 mon/fri sickdays out of 100.

So now you have a number which the chi-square statistic for this test, also called the "

**chi-square-calc**". It’s the one that’s obnoxiously flashing at you. But

what do you **DO** with it? You know that a big number is bad (because it means

that the data deviate alot from the model) and a small number is good (because it means the data

doesn’t deviate). But how big is big, or how small is small?

Before we answer that question, we need to take a brief detour to discuss degrees of freedom.

After that, we can finally answer the question, are Dilbert’s colleagues really out fishing on their long weekends?