Does it take more time to be removed from an email list than it used to take? A study of 100 large online retailers revealed the following:

a. Given that three or more clicks are needed to be removed from an email list, what is the probability that this occurred in 2009?
b. Given that the year 2009 is involved, what is the probability that three or more clicks are needed to be removed from an email list?
c. Explain the difference in the results in (a) and (b).
d. Are needing three or more clicks to be removed from an email list and the year independent?

Transcribed Image Text:

NEED THREE OR MORE CLICKS TO BE REMOVED Yes 39 No YEAR 2009 2008 61 93