descriptive statistics

Question 1

variable measurement scales

Answer 1

assigning numbers to objects so that it can be categorised and analysed

Question 2

nominal scale

Answer 2

groups have no numerical value
can be categorised
e.g. gender, race

Question 3

ordinal scale

Answer 3

groups have an underlying order to their values
intervals may not be equal
e.g. pain rating, likert scale

Question 4

interval scale

Answer 4

groups in categories
difference in values are meaningful
NO ABSOLUTE ZERO
e.g. temperature

Question 5

ratio scale

Answer 5

groups in categories
intervals are equal
TRUE ZERO
e.g. age, weight

Question 6

parametric test

Answer 6

normal distribution

Question 7

non - parametric test

Answer 7

non - normal distribution (skewed data)

Question 8

2 statistical tests to assess normality

Answer 8

Shapiro-Wilk
Kolmogorov-Smirnov

Question 9

3 measured of central tendency

Answer 9

mean
median
mode

Question 10

mean

Answer 10

add all numbers and divide by how many there are

Question 11

mode

Answer 11

number that occurs most frequently

Question 12

median

Answer 12

order numbers and find the middle number

Question 13

variance

Answer 13

small variance = values are closer to the mean of sample
large variance = values are scattered widely from the mean of sample

Question 14

standard deviation

Answer 14

measures average amount that values deviate from the mean
used with normal distribution

Question 15

range

Answer 15

largest value - smallest value

Question 16

interquartile range

Answer 16

upper quartile (75%) - lower quartile (25%)
used with non - normal distribution