3.Two groups of people are surveyed. It is found that in a sample of 40 drivers, single mean drive an average of 85 work-related miles per week, while a sample of 45 married mean shows that they travel an average of 80 work-related miles per week. The standard deviations are 12 and 8 miles, respectively. The alternative hypothesis for the claim that single mean (1) do more work-related driving than married mean (2) is:

a. H1:1 -2>0

b. H1:1 -2<0

c. H1:1 -2=0

d. H1:1 -20

7.A company is hiring candidates for 4 key positions in the management of its new office. 5 candidates are from Malaysia and 3 are from United states. Assuming that every combination of Malaysian and American is equally likely to be selected, what is the probability that at least 1 American will be selected?

a. 4/14

b. 1/14

c. 13/14

d. 5/14