Following from Exercise 37, according to Pew Research, the contact rate (probability of contacting a selected household) in 1997 was 69%, and in 2003 it was 76%. However, the cooperation rate (probability of someone at the contacted household agreeing to be interviewed) was 58% in 1997 and dropped to 38% in 2003.

a) What is the probability (in 2003) of obtaining an interview with the next household on the sample list? (To obtain an interview, an interviewer must both contact the household and get agreement for the interview.)

b) Was an interviewer more likely to obtain an interview from a randomly selected household in 1997 or in 2003?