Descriptive statistics

Question 1

What are measures of central tendency?

Answer 1

The central, most typical value in a data set and are calculated in different ways

Question 2

What are the measures of central tendency?

Answer 2

Mean, median, mode

Question 3

How to calculate the mean?

Answer 3

Add all the results values then divide the answer by how many results were gathered

Question 4

Mean AO3:

Answer 4

• Most accurate and sensitive as it uses all values
• Can be affected by extreme sores because it takes them all into account

Question 5

How to calculate the median?

Answer 5

Put all results in numerical order, the middle value is the median

Question 6

Median AO3:

Answer 6

• Easy to calculate
• Not as sensitive as the mean, only uses one score
• Not influenced by freak scores

Question 7

How to calculate the mode?

Answer 7

The most commonly occurring result

Question 8

Mode AO3

Answer 8

• Easy to calculate
• Less prone to free scores than the mean
• Doesn’t take all scores into account

Question 9

What are measures of dispersion?

Answer 9

Descriptive statistics that define the spread of data around a central value

Question 10

What are the 2 measures of dispersion?

Answer 10

Range and standard deviation

Question 11

What is standard deviation?

Answer 11

Measures the spread of data around the mean. The higher the SD, the more data spread from the mean so less consistent and more individual differences. The lower the SD, the data is more clustered so more consistency and less individual differences.

Question 12

Standard deviation AO3:

Answer 12

• Most sensitive measure of dispersion
• More complicated and time consuming

Question 13

How to calculate the range?

Answer 13

Take the lowest number from the highest number

Question 14

Range AO3:

Answer 14

• Easy to calculate
• Can be distorted by extreme scrores

Question 15

What does the mean tell us?

Answer 15

Provides a good indication of the average score, generally the higher the mean the greater the score/ effect

Question 16

What does standard deviation tell us?

Answer 16

High standard deviation means scores are more spread out so more variation/ individual differences (opposite for low SD)

Question 17

What is a positive correlation?

Answer 17

As the variable increases, the other variable increases

Question 18

What is a negative correlation?

Answer 18

As one variable increases, the other decreases

Question 19

What does zero correlation mean?

Answer 19

Occurs when no relationship is found between variables

Question 20

What is a correlation?

Answer 20

They measure the association relationship is between 2 or more variables (known as co-variables one and two)