Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
statistics |
a collection of numerical data presented in tables and graphs or as numbers that can be used to summarise the essential characteristics of the data. |
|
|
|
Statistics are used in |
weather forecasting, engineering, biology, geology and geography, nursing, education, sociology and psychology, and in legal proceedings. |
|
|
|
Data |
are measurements or observations that are collected as a source of information. |
|
|
|
data unit |
A data unit is one entity (such as a person or business) in the population being studied, about which data are collected. |
|
|
|
data item |
A data item is a characteristic (or attribute) of a data unit which is measured or counted, such as height, country of birth, or income. |
|
|
|
observation |
An observation is an occurrence of a specific data item that is recorded about a data unit. |
|
|
|
dataset |
A dataset is a complete collection of all observations. |
|
|
|
population |
population is used to denote all of the observations, measurements or data values for the characteristic of interest and a descriptive measure of this population is called a parameter. |
|
|
|
census |
When we make measurements on the entire population, this is a census |
|
|
|
x¯ (x bar) |
sample mean |
|
|
|
s |
sample standard deviation. |
|
|
|
Descriptive statistics |
is the branch of statistics concerned with the collection, organisation and presentation of data. |
|
|
|
Inferential statistics |
Inferential statistics or statistical inference is used to analyse sample data so that we can reach meaningful conclusions about the corresponding population. |
|
|
|
variable |
The characteristic being studied is called a variable if it can assume different values. |
|
|
|
data |
We use the term data when referring to the observed values of a variable. |
|
|
|
Discrete variables |
A variable that can assume only separate distinct values is called a discrete variable. |
counting (that is, how many) |
|
|
continuous variable |
A variable that can assume any value within a given interval is called a continuous variable There must be a continuous change (slow or rapid) rather than a jump from one value to another. Continuous variables arise when quantities are measured continuous variables are often recorded in discrete units because of the limitations and accuracy of measurement.
|
|
