If a researcher is interested in knowing whether the proportion of participants in a study sample who currently smoke is lower than the current smoking prevalence reported in a national survey; what test is appropriate?

a.

z-test for 1 proportion, two-sided hypothesis test

b.

z-test for 2 proportions, one-sided hypothesis test

c.

z-test for 1 proportion, one-sided hypothesis test

d.

z-test for 2 proportions, two-sided hypothesis test