Measures of Center and Variability (7thDPS11,12)

What is the first quartile (Q1)?

• Q1 is the median of the upper half of a data set.

• Q1 is the average of the highest and lowest values in a data set.

• Q1 is the median of the lower half of a data set.

• Q1 is the range of the data set.

What is the Interquartile Range (IQR)?

• The IQR is the average of the data set.

• The IQR is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set.

• The IQR is the sum of all the values in the data set.

• The IQR is the median of the data set.

What does it mean for a dot plot to be symmetric?

• A dot plot is symmetric if the left and right sides are mirror images of each other.

• A dot plot is symmetric if all the dots are aligned in a straight line.

• A dot plot is symmetric if it has an equal number of dots on both sides.

• A dot plot is symmetric if it contains no outliers.

What is a dot plot?

• A method to display data using bars to represent values.

• A simple way to display data using dots to represent values.

• A complex graph that shows relationships between variables.

• A type of chart that uses lines to connect data points.

What does it mean if a data set has a high variability?

• It means the data points are spread out over a wider range of values.

• It means the data points are clustered closely together.

• It indicates that the data set has a low mean value.

• It suggests that the data points are all identical.

How do you find the median of an even set of numbers?

• Add the two middle numbers and divide by 2.

• Take the average of all numbers in the set.

• Select the largest number in the set.

• Choose the smallest number in the set.

What is the maximum value in the set: 68, 98, 85, 93?

• 68

• 85

• 93

• 98

What is the definition of variability in statistics?

• Variability refers to how spread out or dispersed the values in a data set are.

• Variability is the average of all data points in a set.

• Variability indicates the maximum value in a data set.

• Variability measures the central tendency of a data set.

How do you find the IQR if Q1 is 20 and Q3 is 35?

• IQR = Q3 - Q1 = 15

• IQR = Q1 + Q3 = 55

• IQR = Q3 / Q1 = 1.75

• IQR = Q1 - Q3 = -15

What is the third quartile (Q3)?

• Q3 is the average of the entire data set.

• Q3 is the median of the lower half of a data set.

• Q3 is the median of the upper half of a data set.

• Q3 is the highest value in the data set.