Types of Data
The data you collect yourself through surveys or experiments
primary data
You find this by adding all the numbers and dividing by how many numbers there are.
The Mean
This graph uses bars to show quantities for different categories.
Bar Graph
This tells how many times a value appears in a data set.
Frequency
A graph shows study time on the X-axis and test scores on the Y-axis. What relationship is this graph showing?
The relationship between time spent studying and performance on a test?
A researcher uses a government report to study employment trends.
Secondary Data
In the data set 1, 2, 2, 3, 4, 4, 4, 5, what is the mode?
4
This graph uses pictures or symbols to represent data quantities.
Pictograph
This is the proportion or percentage of times a value occurs, compared to the total number of values.
Relative Frequency
A graph shows that as the number of absences increases, test scores decrease. What type of correlation is this?
Negative Correlation
This type of data describes qualities or categories, not numbers.
Answer
Qualitative (categorical) data
You find this by subtracting the smallest value from the largest.
The Range
This axis usually goes across the bottom of a graph and is called the independent variable.
The X-axis
In a relative frequency table, all the relative frequencies should add up to this number.
100%
What are two ways you can graph a set of data with multiple variables? (what types of graphs could you use?)
Scatter Plot and Double Bar Graph
Data that can be measured and expressed as numbers
Quantitative (numerical) data?
The numbers are 3, 7, 7, 8, and 10. This is the mean.
7
This graph looks like a bar graph but shows the distribution of data over intervals.
Histogram
If 8 students out of 40 chose pizza as their favorite food, what is the relative frequency of pizza?
0.2 or 20%
You're given a data set with height and shoe size. If you were to graph it, which would most likely go on the X-axis?
Height (the independent variable)
What are the two types of Quantitative Data?
discrete and continuous data
The quiz scores are: 8.5, 9.2, 7.8, 10.0, and 9.5. What is the mean score
9
This type of graph uses dots to show the relationship between two variables.
Scatter Plot
In a class survey, the frequency of students who bike to school is 18 out of 48. What is the relative frequency?
0.37 or 37.5%
In a scatter plot, as the X-values increase, the Y-values also increase. What kind of trend is this?
Positive Correlation