a) The county supervisor of Orange County with over 3 million adults wants to know what percentage of adults in the county currently have Covid-19 antibodies in their systems (blood). Of the following methods, and considering each participant will receive a $100 Amazon gift card for participating, which is the most appropriate way to collect samples? (i) Conduct a census by testing the blood of every adult in the county. (ii) Place a notice on social media platforms asking adults to volunteer to have their blood tested. (iii) Select a random sample of adults with KAISER health insurance and ask each if they would have their blood tested. (iv) Select a random sample of adults using cell phone and home phone records and ask each if they would have their blood tested. b) With the context from above in mind, explain which sampling method would be best, a Stratified Method using cities as the strata, or a Cluster Method using age groups (18-24, 25-29, ...) as the clusters?
a) The county supervisor of Orange County with over 3 million adults wants to know what percentage of adults in the county currently have Covid-19 antibodies in their systems (blood). Of the following methods, and considering each participant will receive a $100 Amazon gift card for participating, which is the most appropriate way to collect samples?
(i) Conduct a census by testing the blood of every adult in the county.
(ii) Place a notice on social media platforms asking adults to volunteer to have their blood tested.
(iii) Select a random sample of adults with KAISER health insurance and ask each if they would have their blood tested.
(iv) Select a random sample of adults using cell phone and home phone records and ask each if they would have their blood tested.
b) With the context from above in mind, explain which sampling method would be best, a Stratified Method using cities as the strata, or a Cluster Method using age groups (18-24, 25-29, ...) as the clusters?
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