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

Median

Answer

Mode

Answer

Range

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

Negative correlation

Answer

No correlation

Answer

Inverse proportion

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

The data has 5 outliers

Answer

The median is 5

Answer

The range is 5

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

12%

Answer

30%

Answer

50%

Question 5

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

Accepted Answer

The middle 50%

Answer

The top 25%

Answer

The bottom 25%

Answer

The full range

Question 6

A student received grades of 80, 90, and 70 in three classes worth 2, 3, and 1 credit hours respectively. What is the weighted average grade?

Accepted Answer

83.3

Answer

80

Answer

82

Answer

85

Question 7

Two fair coins are flipped. What is the probability of getting exactly one head?

Accepted Answer

1/2

Answer

1/4

Answer

3/4

Answer

1/3