MEASURE OF CENTRAL TENDENCY QUIZ

What is the mean of the data set: 10, 15, 20, 25, 30?

• 15

• 20

• 25

• 18

If the median of a dataset is 15, what can we say about the position of the 15th observation?

• It's the middle value when the dataset is arranged in ascending order.

• It's equal to the mean

• It's the lowest value in the dataset.

• It's the highest value in the dataset.

The mean of a dataset is 15. If one observation of value 25 is added to the dataset, what will be the new mean?

• 16

• 17

• 18

• 19

In a dataset, the mean is 20 and the mode is 25. What is the value of the median?

• 18

• 20

• 22

• 25

The range of a dataset is calculated as:

• Highest value - Lowest value

• Sum of all values

• Mean of the dataset

• Mode of the dataset

What does standard deviation measure?

• Average deviation from the median

• Average deviation from the mean

• Deviation from the mode

• Average deviation from the range

The variance of a dataset is 16. If each observation of the dataset is doubled, what will be the new variance?

• 8

• 16

• 32

• 64

The mean deviation about the mean for a dataset is 10. If the mean of the dataset is 30, what is the sum of all absolute deviations from the mean?

• 100

• 150

• 200

• 250

The first quartile (Q1) of a dataset is 12 and the third quartile (Q3) is 24. What is the interquartile range (IQR) of the dataset?

• 10

• 12

• 20

• 24

The 75th percentile of a dataset is 35 and the 25th percentile is 15. What is the semi-interquartile range (SIQR)?

• 10

• 20

• 25

• 30