Flashcards in Graphs Deck (8)

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1

## what are the two types of variables and whats the difference?

### categorical and numerical. caterogorical are qualitative and have no numerical signficance, whereas numerical are quantitative and do have numerical significance

2

## whats a dot plot?

### graph where the data points are represented by dots

3

## whats a histogram?

### represents both numerical and caterogorical data, where classes are used to group similarly categorised data together

4

## what are some words used to describe histograms and what do they mean?

###
symmetric- self explanatory

bimodal- two peaks

unimodal-one peak

bell shaped- if symmetric and unimodal

skewed to the right- tail is on the right, and vice versa

5

## what two things are used to numerically analyse histograms?

### mean of centre and measure of varability

6

## what is the measure of centre?

### represented by the arithmetic mean of the observation values, given by 1/n*sum(from 1 to n) Xi

7

## what is measure of variability?

### represented by the sample variance, given by 1/(n-1) * sum(from 1 to n) (Xi-Xbar)^2, where n is the sample space, and Xi-Xbar represents the diff between the vaue of a data point and the average value

8