Researchers suspected there was a relationship between locus

Researchers suspected there was a relationship between locus of control and medical compliance for adults suffering from Type II diabetes. They selected a sample of 100 patients suffering from diabetes and found that 55 had external locus of control and that 45 had internal locus of control. They then counted how many patients were compliant (yes or no) with their medication regime.

What is the critical value used to test this hypothesis?

Solution

This test is an independent measures t test.

The degrees of freedom is 55+45-2=98

Let the significance level alpha=0.05.

Thus, the one tail critical value is: t(98,0.05)= 1.660