Choosing a Test and Naming the Population(s)
In each case, choose whether the appropriate test is a one-proportion z-test or a two-proportion z-test. Name the population(s).
a. A person is observed to check whether he or she can predict the results of the die roll better than chance alone.
b. A researcher wants to know whether a new skin cream effectively reduces skin rashes compared to an old cream.
c. A survey agency conducts a survey in a city to find out whether the residents like dark and white chocolate equally.
d. A news agency takes a random sample of all corporate professionals to see whether more than 50% approve of the new tax regime.
e. A teacher takes a random sample of students in statistics class to find out whether girls or boys are more likely to remember the conditions for applying z-test.