People with a certain condition have an average of 1.4 headaches per week. A medical researcher believes that the drug she has created will decrease the number of headaches for people with that condition.

1. Identify the population.

A. The average number of headaches the person gets in a week.

B. People who take the drug get less than 1.4 headaches per week on average.

C. People who take the drug get 1.4 headaches per week on average.

D. All individuals who take the medication.


2. What is the variable being examined for individuals in the population?

A. People who take the drug get an average of 1.4 headaches per week

B. The average number of headaches the person gets in a week.

C. The number of headaches the person gets in a week.

D. People who take the drug get less than 1.4 headaches per week on average.


3. Is the variable categorical or quantitative?

A. categorical

B. quantitative


4. Identify the parameter of interest.

A. The proportion of those who take the drug who get a headache.

B. The average (mean) number of headaches that people get per week when using the drug.

C. Whether or not a person who takes the drug gets a headache.

D. All individuals who take the medication.


5. Is the parameter a known value, or is it an unknown value?

A. The parameter is unknown since we don't know the average headaches per week for people who take the medication.

B. The parameter is known: it is an average of 1.4 headaches per week.