Does the rate at which people admit to using illegal drugs depend on how they are asked? You suspect people are more likely to admit to illegal drug use if they complete a paper survey. To test your notion, you plan to ask 2 groups of 50 people the following question, "Have you ever used illegal drugs?" The first group you will ask using a paper survey, the second group you will ask by phone.

Select one:

a.)Two-proportion Z Interval

b.)Z-Test for Two Proportions

c.)Two-sample T Interval for difference in means

d.)Two sample T-test for means