Question: Which of the following is a measure of center that would be heavily influenced by outliers?
Answer Choices:
A. Median
B. Mean
C. Range
D. Standard deviation
E. Interquartile range
Answer: B – Mean
Question: Of interest is to study 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. Specifically, of interest is to use the number of academic credits the student is taking to predict the number of hours of paid work the student does each week. Based on the information above, which of the following is the correct identification of the independent variable?
Answer Choices:
A. Number of academic credits a VCU student is taking
B. Number of hours of paid work the student does each week
Answer: A – Number of academic credits a VCU student is taking
Question: Of interest is to study 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. Specifically, of interest is to use the number of academic credits the student is taking to predict the number of hours of paid work the student does each week. Based on the information above, which of the following is the correct identification of the dependent variable?
Answer Choices:
A. Number of academic credits a VCU student is taking
B. Number of hours of paid work the student does each week
Answer: B – Number of hours of paid work the student does each week
Question: When describing the relationship between two variables, what things must you describe?
Answer Choices:
A. Center, shape, and spread
B. Color and size
C. Direction and form
D. Direction, form and strength
Answer: D – Direction, form and strength
Question: An observation that falls within the range of the other x values but which lies far above or below the regression line and hence produces a large residual is which of the following?
Answer Choices:
A. Extrapolation
B. Outlier
Answer: B – Outlier
Question: A simple random sample of 16 classes being taught at VCU during the fall 2017 semester was selected and for each the number of enrolled students recorded. The data is given below. 63 26 47 48 12 72 31 55 126 66 25 32 44 32 37 Calculate the range of the data.
Answer Choices:
A. 114
B. 106
C. 113
D. 120
Answer: C – 113
Question: A simple random sample of 16 classes being taught at VCU during the fall 2017 semester was selected and for each the number of enrolled students recorded. The data is given below. 63 26 47 48 12 72 31 55 126 66 25 32 44 32 37 Calculate the standard deviation of the data.
Answer Choices:
A. 23.56
B. 25.55
C. 25.56
D. 24.53
Answer: C – 25.56
Question: A simple random sample of 16 classes being taught at VCU during the fall 2017 semester was selected and for each the number of enrolled students recorded. The data is given below. 63 26 47 48 12 72 31 55 126 66 25 32 44 32 37 Calculate the Interquartile Range of the data.
Answer Choices:
A. 41.5
B. 11.6
C. 27.5
Answer: C – 27.5
Question: Which of the following is a graphical method of displaying qualitative or categorical variables?
Answer Choices:
A. Stem-and-leaf plot
B. Pie chart
C. Line chart
D. Boxplot
E. Scatterplot
Answer: B – Pie chart
Question: The main entrees at Chick-fil-A can be grouped into three categories: sandwiches, nuggets/strips, and wraps. If there is no relationship between the category of entree chosen and the restaurant location, which of the following is a true statement?
Answer Choices:
A. Since the conditional distributions are similar, there is not an association between the category of entree chosen and the restaurant location.
B. Since the conditional distributions are significantly different, there is an association between the category of entree chosen and the restaurant location.
C. Since the conditional distributions are similar, there is an association between the category of entree chosen and the restaurant location.
Answer: A – Since the conditional distributions are similar, there is not an association between the category of entree chosen and the restaurant location.
Question: True or false: with two categorical variables we describe the relationship between the two variables by describing the direction, form, and strength of the relationship.
Answer Choices:
A. True
B. False
Answer: B – False
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: Which of the following is a graphical method of displaying qualitative or categorical variables?
Answer Choices:
A. Stem-and-leaf plot
B. Pie chart
C. Line chart
D. Boxplot
E. Scatterplot
Answer: B – Pie chart
Question: The main entrees at Chick-fil-A can be grouped into three categories: sandwiches, nuggets/strips, and wraps. If there is no relationship between the category of entree chosen and the restaurant location, which of the following is a true statement?
Answer Choices:
A. Since the conditional distributions are similar, there is not an association between the category of entree chosen and the restaurant location.
B. Since the conditional distributions are significantly different, there is an association between the category of entree chosen and the restaurant location.
C. Since the conditional distributions are similar, there is an association between the category of entree chosen and the restaurant location.
Answer: A – Since the conditional distributions are similar, there is not an association between the category of entree chosen and the restaurant location.
Question: True or false: with two categorical variables we describe the relationship between the two variables by describing the direction, form, and strength of the relationship.
Answer Choices:
A. True
B. False
Answer: B – False
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