Samples and Populations
What is a population?
What is the mean?
The average
Data that is organized by words is what type of data?
Categorical Data
A line graph is best for which type of data?
Numerical
What is a sample?
The part of a population that is surveyed.
What is the mode?
The most frequently occurring category.
Numerical data
Bar graphs, pie charts and dot plots are best for which type of data?
Categorical
90/100 people liked the play. What percentage of people did not like the play?
10%
What is the range of this data set?
42, 35, 87, 64
Phoebe collects data about how many insects are in a garden. Her categories are: 0, 1, 2, 3, 4, other. What type of data is this?
Categorical
What numerical information should go in the wedge of a pie chart with the category label?
A swimming competition had an attendance of 200 people. 20 people were asked what they thought about the competition. 15 people said they liked the competition.
What percentage of people liked the competition?
75%
How do you calculate median if there are two middle numbers?
Take the average of the two numbers.
What measure of central tendency is best for categorical data and why?
Mode. Mean and Median cannot be calculated.
Tom made a pie chart. He calculated that he has 36 people to include on the pie chart. How many degrees would each person take up?
10o
A swimming competition had an attendance of 200 people. 20 people were asked what they thought about the competition. 15 people said they liked the competition.
How many people in the whole population are estimated to have liked the competition?
15 x 10 = 150
What is the mode of this data set?
1, 2, 2, 2, 3, 4, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 8
There is no mode.
Why can mean and median not be calculated for categorical data?
Categorical Data uses words and not numbers. Thus, these numerical values cannot be calculated.
What are 5 important things to include on a graph?
Title, x and y axis labels, colour, key or legend, ruler, scale