Quiz 1 STAT 302

Question 1 of 20
1.0/ 1.0 Points
A scatterplot allows one to see:

A.whether there is any relationship between two variables

B.what type of relationship there is between two variables

C.Both (a) and (b) are correct

D.Neither (a) nor (b) is correct

Answer Key: C

Question 2 of 20
1.0/ 1.0 Points
The length of the box in the boxplot portrays the

A.mean

B.median

C.interquartile range

D.range

Answer Key: C

Question 3 of 20
1.0/ 1.0 Points
A variable is classified as ordinal if:

A.the data arise from continuous measurements

B.there is no natural ordering of categories

C.there is a natural ordering of categories

D.we track the variable through a period of time

Answer Key: C

Question 4 of 20
1.0/ 1.0 Points
Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12?

A.The mean, median and mode are all equal

B.Only the mean and median are equal

C.Only the mean and mode are equal

D.Only the mean and mode are equal

Answer Key: A

Question 5 of 20
1.0/ 1.0 Points
Which of the following could be a cumulative frequency graph?

A.

B.

C.

D.

Answer Key: A

Question 6 of 20
1.0/ 1.0 Points
The difference between the first and third quartile is called the

A.unimodal range

B.interquartile range

C.mid range

D.interdependent range

Answer Key: B

Question 7 of 20
1.0/ 1.0 Points
The amount of time needed to run the Boston marathon is an example of which type of variable?

A.qualitative

B.continuous

C.discrete

D.none of the above

Answer Key: B

Question 8 of 20
1.0/ 1.0 Points
Which measure of central location is meaningful when the data are categorical?

A.The mean

B.The range

C.The mode

D.The median

Answer Key: C

Question 9 of 20
1.0/ 1.0 Points
The total frequency of the data