CAASPP Data Analysis 2

Question 1

A scatter plot shows points clustered tightly around a line going from lower-left to upper-right. What does this indicate?

Accepted Answer

A strong positive correlation

Answer

Points clustered tightly around an upward-sloping line indicate a strong positive correlation between the two variables.

Question 2

A data set has values: 4, 7, 7, 9, 13. What is the median?

Accepted Answer

7

Answer

With 5 ordered values, the median is the middle (3rd) value, which is 7.

Question 3

Which measure of center is most affected by an outlier in a data set?

Accepted Answer

Mean

Answer

The mean uses all values in its calculation, so a very large or small outlier pulls it significantly.

Question 4

A box plot shows a box from 20 to 40, with a median line at 30 and whiskers from 10 to 50. What is the interquartile range (IQR)?

Accepted Answer

20

Answer

The IQR is Q3 minus Q1, which equals 40 − 20 = 20.

Question 5

In a frequency table, the relative frequency of an event is calculated by dividing the event's frequency by what?

Accepted Answer

The total number of observations

Answer

Relative frequency = (frequency of the event) ÷ (total number of observations).

CAASPP - California Assessment of Student Performance and Progress Practice Test