MATH225N Week 4: Midterm Exam Weeks 1–4

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CLASS:

MATH225N – Statistical Reasoning for the Health Sciences

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MATH225N Week 4: Midterm Exam Weeks 1–4 (correct questions and answers)

QUESTION 1

A researcher is interested in seeing if there is a relationship between the use of a particular software program and age of the user.  The researcher conducts a survey of adults in which she categorizes the respondents into one of two categories, either 18−34 years old or 35 years and older.

Is the study described 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 age of the respondent.

The study is an experiment. The controlled factor is the software program.

The study is an observational study.

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

QUESTION 2

A restaurant asks its patrons to fill out a customer satisfaction survey to rate the food quality. The options are Very Dissatisfied, Somewhat Dissatisfied, Somewhat Satisfied, and Very Satisfied. What is the level of measurement of the data?

Select the correct answer below:

nominal

ordinal

interval

ratio

QUESTION 3

Matthew wants to estimate the mean height of students attending a basketball game. He records the heights of 30 randomly selected students attending the basketball game. 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 basketball game

the 30 randomly selected students

all the students attending the basketball game

the heights of the randomly selected students

QUESTION 4

To study the height of all the students in his school, Christopher records all of the heights of all of the students in his history class. Which type of sampling is used?

Select the correct answer below:

Stratified sampling

Systematic sampling

Cluster sampling

Convenience sampling

QUESTION 5

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

QUESTION 6

Find the median for the following set of data:

13,26,35,44,38,12,47,23,26

Provide your answer below:

Ans: 26………………………………………………………purchase entire exam with correct answers at $25 only