1. Researchers conducted a survey of 150 college students to see how much coffee they drank. The responses were as follows:

response	frequency
2 cups/week	19
1 cup/week	18
1 cup/day	44
2+cups/day	69

A previous study showed the following:

response	% of coffee drinkers
2 cups/week	15%
1 cup/week	13%
1 cup/day	27%
2+cups/day	45%

How many degrees of freedom does this test have?

1

3

2

4

2.