Identify the type of observational study described. a researcher plans to obtain survival rate data for patients whose cancer has gone into remission by following them for the next five years.

retrospective

cross-sectional

prospective

can someone answer this question plz

step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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