Question: Suppose a sample of 35 passengers who have ridden the GRTC Pulse since service was launched is selected, as follows. As they board, passengers are asked if they live in the City of Richmond, Henrico County, Chesterfield County, Hanover County, or another location (5 options). A random sample of 7 passengers who have ridden the GRTC Pulse was selected by location, with 7 passengers randomly chosen from each of the 5 locations. What type of sampling procedure is this an example of?
Answer Choices:
A. Multistage random sampling
B. Stratified random sampling
C. Simple random sampling
D. Haphazard sampling
E. Volunteer response sampling
Answer: B – Stratified random sampling
Question: A sample of 300 passengers who have ridden the GRTC Pulse since service was launched was selected in the following manner: There are a total of 14 GRTC Pulse stations. A random sample of 5 of the 14 GRTC Pulse stations was selected. Then for each of these 5 GRTC Pulse stations (but not the other 9), a random sample of 60 passengers who boarded from that station was selected. What type of sampling procedure is this an example of?
Answer Choices:
A. Multistage random sampling
B. Stratified random sampling
C. Simple random sampling
D. Haphazard sampling
E. Volunteer response sampling
Answer: A – Multistage random sampling
Question: This is a concept/definition question: which of the following sampling methods would give the highest likelihood of getting a sample of GRTC Pulse passengers that is representative of all GRTC Pulse passengers in the population?
Answer Choices:
A. Haphazard sampling
B. Simple random sampling
C. Stratified random sampling
D. Multistage random sampling
E. Volunteer response sampling
Answer: B – Simple random sampling
Question: Which of the following is a true statement?
Answer Choices:
A. A sample is a subset of the population and is always smaller than the population.
B. A sample is always larger than the population.
C. A sample and population are the same.
D. A population is a subset of the sample and is always smaller than the sample.
Answer: A – A sample is a subset of the population and is always smaller than the population.
Question: The oxidized state of the electron carrier NAD+ is __________.
Answer Choices:
A. NAD+
B. NADH
C. NADH2
D. NADPH
Answer: A – NAD+
Question: The high-energy, unstable, intermediate condition of an enzyme and substrate is called the __________.
Answer Choices:
A. Transition state
B. Active site
C. Termination state
D. Induced fit
Answer: A – Transition state
Question: What type of characteristic is “number of enrolled students in a class”?
Answer Choices:
A. Qualitative variable
B. Constant
C. Discrete quantitative variable
D. Continuous quantitative variable
Answer: C – Discrete quantitative variable
Question: Which of the following is a measure of center that is resistant to outliers?
Answer Choices:
A. Standard deviation
B. Median
C. Interquartile range
D. Range
E. Mean
Answer: B – Median
Question: With two categorical variables we cannot describe the direction, form, and strength of the relationship. Instead, we should create a two-way table, a marginal distribution, and then conditional distributions, and compare the conditional distributions to determine if there is a relationship between the two variables or not.
Answer Choices:
A. True
B. False
Answer: A – True
Question: Which of the following is a graphical method that is used to describe the relationship between two quantitative variables?
Answer Choices:
A. Stem-and-leaf plot
B. Boxplot
C. Histogram
D. Bar graph
E. Scatterplot
Answer: E – Scatterplot
Question: It is believed that older students typically have to work more hours to support themselves (and possibly a family) than younger students. Hence the age of the student affects the relationship between the number of academic credits a VCU student is taking this semester and the number of hours of paid work the student does each week. In this scenario, the age of the student is which of the following?
Answer Choices:
A. Lurking variable
B. Residual
C. Dependent variable
D. Outlier
Answer: A – Lurking variable
Question: With Stratified Random sampling you select at least one subject from every group, while in multistage random sampling you first select some groups and hence subjects are not selected from every group?
Answer Choices:
A. True
B. False
Answer: A – True
Question: On their website GRTC Pulse lists five different time periods: AM Peak (6:00-9:00 AM), Midday (9:00 AM – 4:00 PM), PM Peak (4:00 – 7:00 PM), Off Peak (7:00 – 11:30 PM), and Late Night (11:30 PM – 6:00 AM). Of interest is to determine which of these five time periods has the highest passenger satisfaction rating. Hence a study was conducted, as follows. A sample of 40 passengers from each time period was selected (40*5 = 200 total passengers), and as they exited the GRTC Pulse they were asked to complete a very short satisfaction survey. The survey results for the passengers in each group were averaged, then the five averages were compared to determine which time period had the highest passenger satisfaction rating. As described, is this an example of a controlled experiment or an observational study?
Answer Choices:
A. Controlled experiment
B. Observational study
Answer: B – Observational study
Question: To describe a distribution what things must you give?
Answer Choices:
A. Social security number
B. Direction, form, and strength
C. Center, spread, shape and unusual features
D. Color and size
Answer: C – Center, spread, shape and unusual features
Question: What type of sample do we usually prefer?
Answer Choices:
A. Haphazard sample
B. Volunteer response sample
C. Random sample
Answer: C – Random sample