The
proportion of on-line shoppers who actually make a purchase appears
to be relatively constant over time. In 2013, among a sample of 388
on-line shoppers, 160 purchased merchandise. In 2017, for a sample
of 307 on-line shoppers, 144 purchased merchandise. At the .05
level of significance, is there a difference in the proportion of
online shoppers who purchased merchandise, between 2013 and
2017?