7.34 Email outreach efforts. A medical research group is recruiting people to complete short surveys about their medical history. For example, one survey asks for information on a person's family history in regards to cancer. Another survey asks about what topics were discussed during the person's last visit to a hospital. So far, as people sign up, they complete an average of just 4 surveys, and the standard deviation of the number of surveys is about 2.2. The research group wants to try a new interface that they think will encourage new enrollees to complete more surveys, where they will randomize each enrollee to either get the new interface or the current interface. How many new enrollees do they need for each interface to detect an effect size of 0.5 surveys per enrollee, if the desired power level is 80%?

MATLAB: An Introduction with Applications
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With effect size and power given, what is our n value(# of new enrollees)? 

7.34 Email outreach efforts. A medical research group is recruiting people to complete short surveys
about their medical history. For example, one survey asks for information on a person's family history in
regards to cancer. Another survey asks about what topics were discussed during the person's last visit to a
hospital. So far, as people sign up, they complete an average of just 4 surveys, and the standard deviation
of the number of surveys is about 2.2. The research group wants to try a new interface that they think will
encourage new enrollees to complete more surveys, where they will randomize each enrollee to either get the
new interface or the current interface. How many new enrollees do they need for each interface to detect an
effect size of 0.5 surveys per enrollee, if the desired power level is 80%?
Transcribed Image Text:7.34 Email outreach efforts. A medical research group is recruiting people to complete short surveys about their medical history. For example, one survey asks for information on a person's family history in regards to cancer. Another survey asks about what topics were discussed during the person's last visit to a hospital. So far, as people sign up, they complete an average of just 4 surveys, and the standard deviation of the number of surveys is about 2.2. The research group wants to try a new interface that they think will encourage new enrollees to complete more surveys, where they will randomize each enrollee to either get the new interface or the current interface. How many new enrollees do they need for each interface to detect an effect size of 0.5 surveys per enrollee, if the desired power level is 80%?
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