A study1 conducted in July 2015 examines smartphone ownership by US adults. A random sample of people were surveyed, and the study shows that of the men own a smartphone and of the women own a smartphone. We want to test whether the survey results provide evidence of a difference in the proportion owning a smartphone between men and women. Let group be US men and let group be US women.

(a) State the null and alternative hypotheses
(b) Give the notation for the sample statistic.
(c) Give the value for the sample statistic.
(d) In the sample, which group has higher smartphone ownership: men or women?