Afive-year prospective cohort study has just been completed. the study was designed to assess the association between supplemental vitamin a exposure and mortality and morbidity for measles. the rr for incidence of measles was 0.75 and the rr for measles mortality was 0.5.

which statement is correct?

a. a cohort study is not an appropriate study design in this case because the
association between one exposure and two different outcomes is being
considered.

b. one of the problems that this study may have faced is individuals lost to
follow-up during the five-year period.

c. a cohort study is not a good design to study this association because measles is a very common disease.

regarding the rr reported above, which statement is correct?

a. exposure to vitamin a appears to protect against morbidity and mortality
for measles.

b. exposure to vitamin a appears to be a risk factor for morbidity and mortality for measles.

c. exposure to vitamin a is not associated with morbidity and mortality for measles.

d. exposure to vitamin a is a risk factor for morbidity and a protective factor for mortality for measles.

2 & 7

step-by-step explanation:

he climbs 300 ft/hr at a constant rate. the peak is at 1,500 ft.

when going up, he reaches 600 ft in 2 hours. remember, that he is going in a constant rate. divide 600 with 300:

600/300 = 2

assuming that he takes the same route back (meaning that it's a 1500 ft route back, you can solve.

note also that you are solving when he gets back to 600 ft after he reaches the peak.

first, find the amount of hours it takes to get up the peak. divide the total amount (1500), with the ft/her (300) to get the amount of hours (x):

1500/300 = x

x = 5

it takes jamie 5 hours to get up. now, he is returning down, and reaches 600 (his current destination). remember that he climbs at a constant 300 ft/hr. divide 600 with 300:

600/300 = x

x = 2

now add the two numbers together.

x = 5 + 2 = 7

jamie takes 7 hours to go up the mountain and reach his current position when descending.

(total amount/constant rate) = (time).

remember that it is a constant rate, so in total, when he gets back down the mountain, it will take the same amount of time as when he goes up. the total amount for the round trip is: 5 + 5 = 10.

~

you didn't give an question you just gave us a statement

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