A study conducted in July 2015 examines smartphone ownership by US adults. A random sample of 2001 people were surveyed, and the study shows that 688 of the 989 men own a smartphone and 671 of the 1012 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.

(a) State the null and alternative hypotheses, and define the parameters. 

(b) Give the notation and value of the sample statistic. In the sample, which group has higher smartphone ownership: men or women? 

(c) Use StatKey or other technology to find the p-value.