Statistics Descriptive Statistics & Data Summarization

Question 1

Which measure of central tendency is most affected by extreme outliers in a dataset?

Accepted Answer

Mean

Answer

Median

Answer

Mode

Answer

Midrange

Question 2

What does the interquartile range (IQR) measure?

Accepted Answer

The range of the middle 50% of data

Answer

The distance between the mean and median

Answer

The total spread of all data

Answer

The variance of the dataset

Question 3

A dataset has values: 2, 4, 4, 6, 8. What is the median?

Accepted Answer

4

Answer

4.8

Answer

5

Answer

6

Question 4

Which graphical display is best suited for showing the distribution of a single quantitative variable?

Accepted Answer

Histogram

Answer

Bar chart

Answer

Pie chart

Answer

Scatter plot

Question 5

What is the variance of the dataset {2, 4, 4, 4, 5, 5, 7, 9}?

Accepted Answer

4

Answer

2

Answer

16

Answer

3

Question 6

A positively skewed distribution has its tail extending toward which direction?

Accepted Answer

Right

Answer

Left

Answer

Both directions equally

Answer

Neither direction