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The proportion of on-line shoppers who actually make a purchase appears to be relatively constant over...

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?
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