Population: 298,891,000 Deaths: 2,225,000 Live births: ...

[chandani]

Population: 298,891,000
  Deaths: 2,225,000
  Live births: 4,190,000
  Deaths of infants under 1 year of age: 28,000
 
  Deaths of infants under 28 days of age: 6000
  Fetuses delivered without life after 20 weeks of gestation: 37,000
  Women aged 15-44: 62,348,000
 
  Find the crude mortality rate.
  A) 134,333.0 B) 531.0 C) 0.7 D) 7.4

Question 2

To determine whether taking one aspirin each day reduces the risk of heart attacks, researchers assign patients to one of two groups:
 
  (1 ) a group that took one aspirin each day and (2 ) a placebo group. The researchers summarized the sample design as a prospective, randomized, double-blind, placebo-controlled trial. Describe the meaning of each of these terms in the context of this study.

[bdobbins]

Answer to Question 1

D

Answer to Question 2

Prospective: Data is collected in the future from groups that either did or did not get one aspirin each day.
Randomized: Patients were randomly assigned to one of the 2 groups.
Double-blind: Neither the patients or the researchers knew who was given aspirin.
Placebo-controlled: A placebo group was used as a baseline to compare the aspirin group with.

[chandani]

Excellent

[nguyenhoanhat]

Wow, this really help