Grade 8 After 8/6.3

What does a scatter plot show?

• A comparison of percentages using bars and colors

• A relationship between two variables using dots

• A list of all data values organized by size

• How to calculate the average of two variables

On a scatter plot, what does the x-axis usually represent?

• The total distance between data points

• The dependent variable that reacts to change

• The independent variable that you control or change

• The amount of dots plotted on the graph

What kind of correlation is it when x increases and y increases?

• Negative correlation - where values move in opposite directions

• No correlation - the points are completely random

• Strong correlation - where all the dots are close together

• Positive correlation - both variables increase together

What does a strong correlation look like on a scatter plot?

• Dots forming a perfect vertical line from top to bottom

• Dots placed far from each other in random directions

• Dots that are close to forming a straight line

• A group of dots that form a visible circle

What is the purpose of a line of best fit?

• To organize the data points into a straight, perfect line

• To show the general direction or trend of the data points

• To connect every point directly from left to right

• To help estimate the average value of the y-axis only

What is an outlier in a scatter plot?

• A data point that is far from the others and doesn't follow the pattern

• A point that helps define the main shape of the data

• A point located directly on the line of best fit

• A type of dot that appears in every scatter plot automatically

What effect can an outlier have on a scatter plot?

• It helps draw a more accurate line of best fit by increasing the range

• It usually makes the line of best fit less accurate and affects the trend

• It doesn't affect anything unless the graph has more than ten dots

• It helps make the graph easier to read by adding variety

What is a good tool to help draw a line of best fit?

• A calculator that shows the shape of the graph

• A protractor to measure the angle of the points

• A ruler to draw a straight line that follows the trend

• A compass for creating circular graphs

What is a relationship between two variables?

• A cause-and-effect pattern

• A general connection without a clear direction or strength

• A specific kind of graph where all points form a line

• A set of unrelated data pairs

What is a correlation?

• A measurable trend where two variables move together

• A graph that only shows one variable

• A random pairing of variables

• A relationship with no direction