Week 3 Descriptive stats

Question 1

What is a nominal scale?

Answer 1

Subjects are grouped into mutually exclusive categories

Question 2

Provide an example of a nominal scale

Answer 2

Gender Hair colour

Question 3

What is an ordinal scale?

Answer 3

Ranks subjects/scores in order but doesn’t indicate how much better one score is to another

Question 4

Provide an example of an ordinal scale

Answer 4

Position in a race

Question 5

What is an interval scale?

Answer 5

Equal or intervals between data points on a sale, but there is no absolute zero point

Question 6

Provide an example of an interval scale

Answer 6

Temperature

Question 7

What is a ratio scale?

Answer 7

Equal units of measurement and an established zero point

Question 8

Provide an example of a ratio scale

Answer 8

Height Weight

Question 9

What are the measures of central tendency?

Answer 9

Mean Mode Median

Question 10

What is standard deviation?

Answer 10

The average distance away from the mean

Question 11

What does a low standard deviation value mean?

Answer 11

The better the mean describes the data

Question 12

What is skewness?

Answer 12

A measure of lateral deviation form normality

Question 13

Are skewed distributions symetrical?

Answer 13

No

Question 14

What does it mean is the graph is positively skewed?

Answer 14

‘Tail’ of the distribution if positioned at the upper end of the score continuum

Question 15

What does it mean if the graph is negatively skewed?

Answer 15

‘Tail’ of the distribution if positioned at the lower end of the score continuum

Question 16

What is kurtosis?

Answer 16

A measure of vertical deviation from normality

Question 17

What does it mean if a graph is leptokuritc?

Answer 17

Curve is more peaked than a normally distribited curve

Question 18

What does it mean if a graph is platykurtic?

Answer 18

Curve is more flat than a normally distribited curve

Question 19

What is the acceptable range of skewness?

Answer 19

-1 and +1

Question 20

What is the acceptable range of kurtosis?

Answer 20

-1 and +2

Question 21

What do z-score allow?

Answer 21

Compare variable with different units

Question 22

How do z-scores work?

Answer 22

By calculating the number of SD’s away from the population mean.

Question 23

How is the graph distributed?

Answer 23

Positively skewed

Question 24

How is the graph distributed?

Answer 24

Negatively skewed

Question 25

How is the graph distributed?

Answer 25

Leptokurtic

Question 26

How is the graph distributed?

Answer 26

Platykurtic

Question 27

Label the central tendency used

Answer 27

1. Mean
2. Median
3. Mode

Question 28

Label the central tendency

Answer 28

1. Mode
2. Median
3. Mean