Descriptive statistics – tables and graphs Flashcards Preview

Psychology A2 Research Methods > Descriptive statistics – tables and graphs > Flashcards

Flashcards in Descriptive statistics – tables and graphs Deck (19):
1

What is raw data?

The data that are first produced a study and is unprocessed

2

What is the last thing you would usually do with raw data?

An organised table

3

What is a frequency table?

Where a researcher records raw data by counting the frequency of different items

4

When is a frequency table unsuitable

When the data from many items are repeated

5

What are the different types of graphs

Bar charts, histograms, line graphs, pie charts, scatter grams

6

What is a bar chart

A chart that represents the frequency of categories

7

In a bar chart the categories are usually place on which axis?

X-axis

8

In a bar chart that the frequency is usually placed on which axis?

Y-axis

9

What is a histogram?

Bars are proportional to the frequency represented so the vertical axis starts at zero and there are no spaces between the bars

10

What is a line graph?

This has continuous data on the X axis and each.shows the middle top of where the bar would be. Each dot is connected by a line

11

What is a pie chart

They are used to represent frequency data or can be used to represent any proportion. Each slice of the pie represents the proportion or fraction of the total.

12

How is the size of each slice calculated in a pie chart?

By working out the proportion out of 360 (since there are 360° in a circle)

13

What is a scatter gram?

A kind of graph used when doing a correlational analysis

14

What Does the term data distribution mean?

when studying large datasets we can see an overall pattern of the data called a distribution

15

What is the curve 0f a normal distribution

The normal distribution is a classic bell-shaped curve

16

What are the three defining features of a normal distribution

The mean and median and mode are all in the exact midpoint,
the distribution is symmetrical around this midpoint and
the dispersion of scores or measurements either side of the midpoint is consistent and can be expressed in standard deviations

17

What is a skewed distribution?

When population scores are not distributed equally around the mean

18

What is a positive skewed distribution

Most of the scores in a frequency distribution are bunched to the left with a tail to the right

19

What is a negative skewed distribution

Most of the scores in a frequency distribution are bunched to the right with a tale to the left