QUESTION 1 . 1 POINT

In a study on college study habits, a researcher randomly selected an equal number of male college students and female college students to survey. Is the study observational or experimental? If it is an experiment, what is the controlled factor?

Select the correct answer below:

The study is an experiment. The controlled factor is a person's study habits.

The study is an observational study.

The study is an experiment. The controlled factor is the survey.

The study is an experiment. The controlled factor is the category, male or female.

QUESTION 2 . 1 POINT

Collecting credit scores of mortgage applicants is always part of the mortgage approval process for many banks. Credit scores range from 300 to 850. What is the level of measurement of the data?

Select the correct answer below:

nominal

ordinal

interval

ratio

QUESTION 3 . 1 POINT

Matthew wants to estimate the mean height of students attending his college. He records the heights of 235 randomly selected students attending the college. What is the population?

Select the correct answer below:

the mean height of the randomly selected students

the mean height of all students attending the college

the 235 randomly selected students

all the students attending the college

the heights of the randomly selected students

QUESTION 4 . 1 POINT

To study the sleeping habits of all band members in his school, Christopher collects data from all the band members in his math class. Which type of sampling is used?

Select the correct answer below:

Systematic sampling

Stratified sampling

Cluster sampling

Convenience sampling

QUESTION 5 . 1 POINT

In order to study the mean blood pressure of people in his town, Richard samples the population by dividing the residents by age and randomly selecting a proportionate number of residents from each age group. Which type of sampling is used?

Select the correct answer below:

Convenience sampling

Cluster sampling

Stratified sampling

Systematic sampling