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

Which two are examples of descriptive statistics?

• Median and Correlation

• Variance and regression analysis

• Hypotesis testing and Histograms

• Means and Standar Deviation

How do descriptive statistics and inferential statistics differ?

• Descriptive statistics or more computationally shopisticated than inferential statistics

• Descriptive statistics only attempt to describe data while inferential statistics attempt to make predictions based on data.

• Inferential statistics or more computationally shopisticated than descriptive statistics

• Inferential statistics only attempt to describe data while descriptive statistics attempt to make predictions based on data

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

What is the mode?

• The average

• biggest - smallest

• # happening the most

• The middle #

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