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There are three common ways of describing the centre of a set of numbers. They are the mean, the median and the mode and are calculated as follows. The mean add up all the numbers and divide by how many numbers there are. The median is the middle number. It is found by putting the numbers in order.
Descriptive Statistics summarizes or describes the important characteristics of a known set of population data Inferential Statistics uses sample data to make inferences about a population 2-1 Overview
Table 3.1 gives three simple numerical examples. In the first example, the data are symmetrical about the mean of 20. The first observation is 10 below the mean, the second is equal to the mean, and the third is 10 above the mean. In the second example, the increase in the value of the third observation from 30 to 90 pulls the mean up to 40.
The mode is rarely an informative statistic about the central tendency of the data. It’s most useful in describing the “typical” observation of a categorical variable
The goal of descriptive statistics is to aggregate the individual scores (datum) in a way that can be readily summarized ! A frequency distribution table can be used to get “picture” of how scores were distributed
In this chapter, you will study numerical and graphical ways to describe and display your data. This area of statistics is called "Descriptive Statistics." You will learn how to calculate, and even more importantly, how to interpret these measurements and graphs.
To begin with, we will obtain a table of descriptive statistics that will investigate the continuous variable of Purchases, to answer the following question: do males and females differ in terms of how many times a month they eat fast food? 1. A simple table: how often do men and women eat fast food?
