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

Write an explanation with each answer
Chapter 21
Kostas remembered getting the flu (influenza) last winter:
coughing, fever, achiness all over his body, watery eyes, and
fatigue. He felt awful but he argued, “What’s the point of a flu
shot, when all it does is give you the flu?” Kostas did not
understand that the flu vaccine is a combination of several
inactivated (killed) viruses injected into muscles in your body
(usually in your arm). No live viruses are injected....

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22
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