CLAST Statistics and Probability 5

Question 1

A scatter plot shows a strong positive correlation between study hours and test scores. Which statement is best supported?

Accepted Answer

More study hours are associated with higher test scores

Answer

Test scores cause more study hours

Answer

Study hours have no effect on test scores

Answer

The relationship is negative

Question 2

A class of 30 students took a quiz. The median score was 74. What does this tell us?

Accepted Answer

Half the class scored below 74

Answer

The average score is 74

Answer

Most students scored 74

Answer

74 is the highest score

Question 3

A card is drawn from a standard 52-card deck. What is the probability it is a face card (Jack, Queen, or King)?

Accepted Answer

3/13

Answer

1/4

Answer

3/52

Answer

1/13

Question 4

The interquartile range (IQR) of a data set is 18. Q1 = 22. What is Q3?

Accepted Answer

40

Answer

4

Answer

36

Answer

44

Question 5

Which of the following describes a sample that is likely to produce biased results?

Accepted Answer

Surveying only students who visit the school library

Answer

A random sample of 500 voters from across the state

Answer

Using a computer to randomly select participants

Answer

Drawing names from a hat

Question 6

A data set's values range from 20 to 80. If you add a new data point of 500, which measure changes the LEAST?

Accepted Answer

Median

Answer

Mean

Answer

Range

Answer

Standard deviation

Question 7

A student rolls a six-sided die three times. What is the probability of rolling a 6 on all three rolls?

Accepted Answer

1/216

Answer

1/6

Answer

1/18

Answer

1/36