Rise Placement Test Statistics and Data Analysis 2

Question 1

Which measure of central tendency is most affected by an extreme outlier in a data set?

Accepted Answer

Mean

Answer

The mean uses every data value in its calculation, so an extreme outlier pulls it significantly higher or lower.

Question 2

A scatter plot shows that as study hours increase, test scores also increase. This relationship is best described as:

Accepted Answer

Positive correlation

Answer

When both variables increase together, the data displays a positive correlation.

Question 3

A data set has a mean of 50 and a standard deviation of 5. What does a standard deviation of 5 tell you?

Accepted Answer

Most data points are within 5 units of the mean

Answer

Standard deviation measures the average spread around the mean, so a value of 5 means data typically falls within 5 units of 50.

Question 4

A frequency table shows: Score 60–69 (5 students), 70–79 (8 students), 80–89 (12 students), 90–99 (5 students). What percent scored in the 80–89 range?

Accepted Answer

40%

Answer

Total students = 5+8+12+5 = 30; 12/30 × 100 = 40%.

Question 5

In a box-and-whisker plot, the box itself represents which portion of the data?

Accepted Answer

The middle 50%

Answer

The box spans from the first quartile (Q1) to the third quartile (Q3), capturing the interquartile range (middle 50%).

Rise Placement Test Practice Test

Rise Placement Test Practice Test

Rise Placement Test Statistics and Data Analysis 2