Mathematics, 17.04.2020 03:13, anggar20
An ultramarathon, as you might guess, is a footrace longer than the 26.2 miles of a marathon. Runners commonly develop respiratory infections after an ultramarathon. Will taking 600 milligrams of vitamin C daily reduce these infections? Researchers randomly assigned ultramarathon runners to receive either vitamin C or a placebo. Separately, they also randomly assigned these treatments to a group of nonrunners the same age as the runners. All subjects were watched for 14 days after the big race to see if infections developed. (E. M. Peters et al., "Vitamin C supplementation reduces the incidence of postrace symptoms of upper-respiratory tract infection in ultramarathon runners," American Journal of Clinical Nutrition, 57 (1993), pp. 170-174.) (a) What type of study is this? Observational study: prospective Observational study: retrospective Observational study: cross-sectional Experiment: matched pairs design Experiment: randomized block design Experiment: completely randomized design (b) What are the explanatory variables? Select all that apply. Gender (male, female) Vitamin C supplementation (yes, no) Respiratory infection (yes, no) Runner (yes, no) (c) What is the response variable? Gender (male, female) Respiratory infection (yes, no) Runner (yes, no) Vitamin C supplementation (yes, no)
Answers: 1
Mathematics, 21.06.2019 15:00, erykp17
Which statement is true? the given sides and angles cannot be used to show similarity by either the sss or sas similarity theorems. the given sides and angles can be used to show similarity by the sss similarity theorem only. the given sides and angles can be used to show similarity by the sas similarity theorem only. the given sides and angles can be used to show similarity by both the sss and sas similarity theorems.
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Mathematics, 21.06.2019 18:30, Prolearner1234
For each polynomial, determine the degree and write the polynomial in descending order. a. –4x^2 – 12 + 11x^4 b. 2x^5 + 14 – 3x^4 + 7x + 3x^3
Answers: 2
Mathematics, 21.06.2019 21:30, noeltan12031
Using the information in the customer order, determine the length and width of the garden. enter the dimensions. length: feet width: feet
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Mathematics, 21.06.2019 23:00, karyme12
I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )
Answers: 1
An ultramarathon, as you might guess, is a footrace longer than the 26.2 miles of a marathon. Runner...
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