 # STA 2014-2 STA2014-2 Week 3 Quiz

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STA 2014-2 Week 3 Quiz

Quiz Week 3

1. Classify the following random variable according to whether it is discrete or continuous: The number of cups of coffee sold in a cafeteria during lunch. (Points : 5)

discrete

continuous

2. A student is asked to rate an instructor's ability to teach on a scale of poor - average - good - excellent.  The student is to fill in a corresponding circle on a bubble form.  This is an example of collecting what type of data? (Points : 5)

Discrete

Qualitative

Continuous

Insightful

3. People's body fat percent are measured before and after a 4 week exercise program. This is an example of a ______________. (Points : 5)

Completely randomized design

Matched-pair design

Double-blind design

Cluster design

4. In a relative frequency distribution, what should the relative frequencies add up to? (Points : 5)

0.1

1

10

100

5. A researcher chooses a random sample of two patients by going into a waiting room at 4 pm and talking to two patients there.  This is not a good random sample because ______________. (Points : 5)

Children may be overrepresented

The researcher may have certain preferences

All of the above

6. A person, object, or other well-defined item upon which a treatment is applied is ______________. (Points : 5)

a control group

the predictor variable

an experimental unit

the factor

7. Classify the number of seats in a movie theater as qualitative data or quantitative data. (Points : 5)

Quantitative data

Qualitative data

8. A(n) _______ is a person, object, or some other well-defined item upon which a treatment is applied. (Points : 5)

Treatment

Experiment unit

Factor

Response variable

9. Which of the following is not a source of bias in sampling? (Points : 5)

Sampling bias

Non-response bias

Response bias

Non-sampling bias

10. A census is a list of all individuals in a population along with certain characteristics of each individual. (Points : 5)

True

False

11. The class width is the difference between______________. (Points : 5)

The largest frequency and the smallest frequency

The upper class limit and the lower class limit of a class

Two successive lower class limits

The high and the low data values

12. A stem-and-leaf plot is one way to represent qualitative data graphically. (Points : 5)

True

False

13. The colors of automobiles on a used car lot represent ______________. (Points : 5)

qualitative data

quantitative data

a statistical study

a continuous variable

14. Which branch of statistics deals with the organization and summarization of collected information? (Points : 5)

Inferential statistics

Computational statistics

Survey design

Descriptive statistics

15. Multiple choice questions on a test that include as one of the choices "None of the above" are an example of what type of question? (Points : 5)

Closed ended question

Framing question