Suppose that you want to compare the percentage of undergraduate students at UCR who wear clothing that says "University logo" to the percentage of graduate students at the University who wear such clothing. You and your friend (who is a grad student) coordinate. You select a random sample of undergrads, she selects a random sample of grads.

1.) You come together and put all of your data in the same data matrix. What kind of sampling was done to collect this data?

a.) Simple Random Sampling

b.) Stratified Random Sampling

c.) Cluster Sampling

d.) Multi-Stage Sampling

2.) Which of the following results provides the strongest evidence that the percentages differ between the two types of students?

a.) 40 of 100 undergrads wear UCR clothing, compared to 10 of 100 grad students

b.) 35 of 100 undergrads wear UCR clothing, compared to 15 of 100 grad students

c.) 30 of 100 undergrads wear UCR clothing, compared to 20 of 100 grad students

3.) Which of the following results provides the strongest evidence that the percentages differ between the two types of students?

a.) 4 of 10 undergrads wear UCR clothing, compared to 1 of 10 grad students

b.) 20 of 50 undergrads wear UCR clothing, compared to 5 of 50 grad students

c.) 40 of 100 undergrads wear UCR clothing, compared to 10 of 100 grad students