BSNS 112 Exam Preparation
- methods of organising, summarising and presenting
Descriptive statistics data in a good form
e.g. graphs, tables, measures
Random sample of data taken from a population to
Inferential statistics
describe and make inferences about the population
Types of data quantitative and qualitative
Numerical
Quantitative data
e.g. Age in years
Grouped or categorical
Qualitative data
e.g. S, M, L, XL, XXL
, Categorical data Nominal or Ordinal
(Qualitative)
Numerical data Discrete or Continuous
(Quantitative)
Frequency x
Proportion p
Mean average
Median middle number
Mode most common number
Trimmed mode most common number with extreme 5% trimmed
Mean
Media
Central locations
n
Mode
Trimmed Mode
Measures of spread Range
Interquartile range
Variance
Range Max observation less Minimum
IQR Middle 50%
Variance Squared deviation around the mean
average distance observations are away from the
Standard Deviation (SD) mean
no units = good for comparisons
relative measure of variability
Coefficient of
variation
used to compare variability between groups with
different means
- methods of organising, summarising and presenting
Descriptive statistics data in a good form
e.g. graphs, tables, measures
Random sample of data taken from a population to
Inferential statistics
describe and make inferences about the population
Types of data quantitative and qualitative
Numerical
Quantitative data
e.g. Age in years
Grouped or categorical
Qualitative data
e.g. S, M, L, XL, XXL
, Categorical data Nominal or Ordinal
(Qualitative)
Numerical data Discrete or Continuous
(Quantitative)
Frequency x
Proportion p
Mean average
Median middle number
Mode most common number
Trimmed mode most common number with extreme 5% trimmed
Mean
Media
Central locations
n
Mode
Trimmed Mode
Measures of spread Range
Interquartile range
Variance
Range Max observation less Minimum
IQR Middle 50%
Variance Squared deviation around the mean
average distance observations are away from the
Standard Deviation (SD) mean
no units = good for comparisons
relative measure of variability
Coefficient of
variation
used to compare variability between groups with
different means
