DEFINITIONS
What measure of central tendency is calculated by adding all the values and dividing the sum by the number of values?
Mean
What is the mean of the following numbers?
10, 39, 71, 39, 76, 38, 25
42.5
It is a set of all possible values of a variable.
Population
First step in finding the variance
First step: Find the mean of the data.
It is collection of methods for planning experiments, obtaining data and then analyzing, interpreting and drawing conclusions based on the data.
STATISTICS
What number would you divide by to calculate the mean of 3, 4, 5, and 6?
4
It is a subgroup of a population.
Sample
What is the 2nd step in finding the variance?
Find the difference between the given and the mean.
Measurements or observations that are collected as a source of information.
Data
Find the mean of the following data: 12, 10,15, 10, 16, 12,10,15, 15, 13?
12.8
Height, weight and household size are examples of _______ variables.
Quantitative
3rd step in finding the variance
square the difference
It is any characteristic, number, or quantity that can be measured or counted.
Variable
Find the mean of the following data: 0, 5, 2, 4, 0, 5, 0,3, 0, 5, 0, 3
2.25
Gender, religion and marital status are examples of _______ variable.
Qualitative
4th step in finding the variance
find the sum of their difference
It is a measure of how data points differ from the mean.
Variance
Find the mean of the following data: 20, 24, 24, 24, 22, 22, 24, 22, 23, 25
23
Data that can be counted
Discrete random variable
how to find the standard deviation?
get the square root of the variance