Your friend is interested in whether cat owners or dog owners sleep longer than people without pets, but isn't sure whic

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Your Friend Is Interested In Whether Cat Owners Or Dog Owners Sleep Longer Than People Without Pets But Isn T Sure Whic 1 (84.6 KiB) Viewed 107 times

Your friend is interested in whether cat owners or dog owners sleep longer than people without pets, but isn't sure which animal to base her theory on. She collects a preliminary sample of 30 cat owners, 30 dog owners, and 100 people without pets. Looking at the data, your friend observes that cat owners get more sleep than dog owners and the people without pets, but doesn't conduct any formal test. Instead, she recruits 30 more cat owners for a total of 60. A nominal t-test of these 60 cat owners with the 100 people without pets shows that cat owners get more sleep than people without pets. Give an argument for why this procedure has an inflated error rate.