18 Since many individuals walk around their homes in their socks a manufacturer has created...
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18 Since many individuals walk around their homes in their socks a manufacturer has created a material for socks that is believed to be more resistant to wear than cotton The manufacturer wishes to test this belief over a period of a month Given a group of volunteers which of the following designs will best test this new material s resistance to wear A have the volunteers wear the socks made from the new material for a month and check the wear on the socks at the end of the month B Allow half of the volunteers to wear cotton socks while the other half wear socks made of the new material Compare the wear on the socks at the end of the month C Randomly assign half of the volunteers to wear cotton socks while the other half wear socks made of the new material Compare the wear on the socks at the end of the month D Randomly assign half of the volunteers to wear cotton socks while the other half wear socks made of the new material At the end of two weeks the volunteers should change sock types Compare the wear on the socks at the end of the month E For each volunteer randomly choose which foot wears a cotton sock while the other foot wears a sock made of the new material Compare the wear on the socks at the end of the month
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