Stats Short Quiz

Chapter 2 Analytics

QUESTION 1

1.

When summarizing two categorical columns of data, which of the following methods is the best for displaying the data?

	A.	contingency table
	B.	bar chart
	C.	pie chart
	D.	histogram

0.5 points   

QUESTION 2

1. One of the developing countries is experiencing a baby boom, with the number of births rising for the fifth year in a row, according to a BBC News report. Which of the following is best for displaying this data?

	A.	A bar chart
	B.	A pie chart
	C.	A histogram
	D.	A time-series plot

0.5 points   

QUESTION 3

1. Which of the following is appropriate for displaying data collected on the different brands of cars students at a major university drive?

	A.	A bar chart
	B.	A contingency table
	C.	A histogram
	D.	A scatter plot

0.5 points   

QUESTION 4

1. The dataset CandidateAssessment.csv can be downloaded from here:

Which of the following table is a correct summary for the column "Competence Rating"

	A.	Rating 1 2 3 4 5 6 7 Frequency 18 9 28 29 25 10 6
	B.	Rating 1 2 3 4 5 6 7 Frequency 8 19 20 29 20 16 8 NOT THE ANSWER
	C.	Rating 1 2 3 4 5 6 7 Frequency 8 19 28 29 20 10 6
	D.	Rating 1 2 3 4 5 6 7 Frequency 8 19 25 26 28 10 6

0.5 points   

QUESTION 5

1. Question 4 continues. Which of the following statements is the most suitable for the type of data for the column "Competence Rating"?

	A.	Continuous data
	B.	Categorical data
	C.	Ordinal data
	D.	ratio-scale data

NO0.5 points   

QUESTION 6

1. Question 4 continues. Which of the following table correctly summarizes the relative frequency distribution for the column "Competence Rating"?

	A.	Rating 1 2 3 4 5 6 7 Relative Frequency 17% 6% 20% 27% 17% 8% 5%
	B.	Rating 1 2 3 4 5 6 7 Relative Frequency 7% 16% 23% 24% 17% 8% 5%
	C.	Rating 1 2 3 4 5 6 7 Relative Frequency 7% 19% 20% 29% 12% 8% 5%
	D.	Rating 1 2 3 4 5 6 7 Relative Frequency 7% 16% 23% 14% 15% 10% 15%

0.5 points   

QUESTION 7

1. Question 4 continues.  By presenting the scatter plot for x=Age Rater, y=Salary, which of the following statements best describes the relationship between age and salary? 

		Salary is strongly  related to age, the higher the age, the higher the salary.
		Salary is strongly  related to age, the higher the age, the lower the salary.
		Salary is weakly  related to age, there is no much relationship.
		The scatter plot shows no information on the relationship between age and salary.

0.5 points   

QUESTION 8

1. Question 4 continues. By presenting the histogram for the “Salary” column with breaks=20 in the hist command, which of the following conclusion is the most appropriate?

	A.	The chance of getting salary higher than 35 is larger than the chance of getting salary lower than 35.
	B.	The chance of getting salary lower than 35 is larger than the chance of getting salary higher than 35.
	C.	The chance of getting salary higher than 35 is equal to the chance of getting salary lower than 35.
	D.	The chance of getting salary higher than 35 is half the chance of getting salary lower than 35.

0.5 points   

QUESTION 9

1. Question 4 continues. By presenting the side-by-side (1 by 2) histograms with breaks=20 for the salary data for male candidates and for female candidates, which of the following conclusions is the most appropriate? 

	A.	Male candidates have a bigger chance to get salary higher than 40.
	B.	Female candidates have a bigger chance to get salary higher than 40.
	C.	Male and female candidates have the same chance to get salary higher than 40.
	D.	The data cannot provide the conclusions in A, or B, or C above.

0.5 points   

QUESTION 10

1. Question 4 continues. By presenting the contingency table for  x="Department" and y="Gender-Candidate", which of the following statements is true?

	A.	There are more male candidates from Biology than from Chemistry.
	B.	There are more male candidates from Biology than from Physics.
	C.	There are more female candidates from Physics than from Chemistry.
	D.	There are equal number of male candidates and female candidates from all three departments.

0.5 points