
STA 2014-2 STA2014-2 Week 3 Quiz
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
Working adults may be underrepresented
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
Reader response question
Open ended question