Question

4. A researcher wants to study the effects of getting a flu vaccination on actually getting the flu virus for healthy adult Americans. The researcher randomly selects 100 participants from a list of healthy patients; 50 of those selected agree to participate. The 50 are randomly assigned to one of two groups: members of group 1 receive a flu vaccination and members of group 2 receive a placebo. In 4 weeks, participants were contacted and asked if they had contracted the flu virus.

Who is the population?

b) All Americans

c) Healthy, adult Americans

d) The 100 selected to participate

5. Who is the sample?

a) All Americans

b) Healthy, adult Americans

c) The 100 selected to participate

d) The 50 participants

e) The 25 who receive the flu vaccine

6. What is the independent variable?

a) The participants of the study

b) The vaccination

c) The selection of participants

d) The contraction of the flu virus

7. What is the dependent variable?

a) The participants of the study

b) the vaccination

c) The selection of participants

d) The contraction of the flu virus

Answer 1

4. Who is the population?

c) Healthy, adult Americans is the correct option

Reason : Since, the effect has be studied on healthy adult Americans.

5. Who is the sample?

d) The 50 participants is the correct option

Reason : 50 of those selected agree to participate are considered sample

6. What is the independent variable?

b) The vaccination is the correct option

Reason : effect of vaccination is checked

7. What is the dependent variable?

d) The contraction of the flu virus  is the correct option

Reason : effect of contraction flu virus is studies