College Math Placement Test Statistics 3

Question 1

A boxplot shows Q1 = 20, median = 35, Q3 = 50. What is the interquartile range (IQR)?

Accepted Answer

30

Answer

15

Answer

35

Answer

25

Question 2

Which of the following describes a negatively skewed distribution?

Accepted Answer

Mean < Median < Mode

Answer

Mean > Median > Mode

Answer

Mean = Median = Mode

Answer

Mode > Mean > Median

Question 3

A correlation coefficient of r = −0.92 indicates:

Accepted Answer

A strong negative relationship

Answer

A weak positive relationship

Answer

No relationship

Answer

A moderate positive relationship

Question 4

A student rolls a fair die twice. What is the probability of getting a 6 on both rolls?

Accepted Answer

1/36

Answer

1/6

Answer

1/12

Answer

2/6

Question 5

A survey asks 200 people about their preferred genre. The results are displayed in a pie chart. If 30% prefer drama, how many people prefer drama?

Accepted Answer

60

Answer

30

Answer

70

Answer

15

Question 6

What does a z-score of −2 tell you about a data point?

Accepted Answer

It is 2 standard deviations below the mean

Answer

It is 2 units below the mean

Answer

It is 2% below the median

Answer

It is below the mode by 2

Question 7

Which sampling method divides a population into subgroups and randomly selects from each subgroup?

Accepted Answer

Stratified sampling

Answer

Simple random sampling

Answer

Cluster sampling

Answer

Systematic sampling