Descriptive Statistics

What do descriptive statistics describe?

• How small the data range is

• the central tendency of the data and the spread

• How big the numbers are

• A story

What is the definition for mean?

• The central value when values are arranged highest to lowest

• The average, adding up all the values and dividing by the amount

• most frequently occurring value in a set of data.

• all correct

What is the definition of median in statistics?

• The median is the middle score

• The median is the average of the scores

• The median is the spread of the score

• The median is the most occurring score

The variability of a statistic is described by

• the spread of its sampling distribution. 

• the amount of bias present.

• the different values it will takefrom each of the samples.

• the stability of the population it describes. 

Measures of variability are numbers that describe diversity in the distribution.

• True

• False

How do you get the range of a number sequence?

• None are correct

• You add the largest and smallest

• you subtract the smallest number from the largest number.

• Divide by 2

What is the range of this data?

• 30

• 40

• 50

• 60

What is the interquartile range?

• The span between the first quartile and the third quartile

• The span between the lowest score and the highest score

• The simplest measure of variability to calculate

• one-fourth of a distribution of scores

How do you calculate Standard Deviation?

• Square the variance

• Divide an ordered data four equal parts

• Square root the variance

• Square the mean

Descriptive statistics consists of methods of organizing, summarizing and presenting data in an informative way.

• True

• False