1. Thirty eight percent of young adults say they use credit cards because of the rewards program. Seven young adults are selected at random.
a) In the sample of seven young adults, what is the probability that all of the adults use credit cards because of the rewards program?
b) What is the probability at least 2 of the seven young adults uses credit cards because of the rewards program? Don't calculate just write a formula.
2. pollsters asked a question " Do you belive global warmin exist?" 82% said "yes" and Fox News reported a margin of error to be +or - 3%. Assuming that fox News used a 95% confidence level, what does Fox News mean by claming a marfin of error of + or - 3% .
a) We can be 95% confident that the sample % is between 79% and 85%.
b) We can be 95% confident that the population % is between 79% and 85%
c) The population % is between 79% and 95%
d) 95% of the people believe that global warming exists.