. A study of cell phones and the associated risk of brain cancer looked at a group of 519 people who have brain cancer. The investigators matched each cancer patient with a person of the same sex, age, and race who did not have brain cancer, then asked about their use of cell phones. This kind of study is known as eBook O prospective retrospective observational O double-blind

MATLAB: An Introduction with Applications
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. A study of cell phones and the associated risk of brain cancer looked at a group of 519 people who have brain cancer. The investigators matched each cancer patient with a person of
the same sex, age, and race who did not have brain cancer, then asked about their use of cell phones. This kind of study is known as
eBook
O prospective
retrospective
O observational
O double-blind
Transcribed Image Text:. A study of cell phones and the associated risk of brain cancer looked at a group of 519 people who have brain cancer. The investigators matched each cancer patient with a person of the same sex, age, and race who did not have brain cancer, then asked about their use of cell phones. This kind of study is known as eBook O prospective retrospective O observational O double-blind
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# Retrospective study:A study that compares two groups of people those with the disease or condition under study "cases"and a very similar group of people who do not have the disease or condition "controls" and study the factor behind the diseas: in the above case the investigator matches the each cancer patients with a person of same age ,sex and race who didn't have brain cancer.

 

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