Mathematics, 28.11.2019 02:31 mya1318
To test the efficacy of vitamin c in preventing colds, army recruits are randomly assigned to one of two groups: one in which 500 mg of vitamin c is administered daily, and one in which 500 mg of a placebo is administered daily. both groups are followed to determine the number and severity of subsequent colds. what type of study design is this? cross-sectional study case-control study prospective cohort study historical prospective cohort study clinical trial community physical examination records of the incoming freshmen class of 1935 at the university of minnesota are examined in 1980 to see whether their recorded height and weight at the time of admission to the university are related to their chance of developing coronary heart disease by 1981. what type of study design is this? cross-sectional study case-control study prospective cohort study historical prospective cohort study clinical trial community trial
Answers: 2
Mathematics, 21.06.2019 14:50
An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x
Answers: 1
Mathematics, 21.06.2019 16:40
Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5
Answers: 1
Mathematics, 21.06.2019 17:30
Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?
Answers: 3
To test the efficacy of vitamin c in preventing colds, army recruits are randomly assigned to one of...
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