2024 8th Grade Math 1st Semester Review

Front

What is a scatter plot?

Back

A scatter plot is a graph that shows the relationship between two quantitative variables. Each point on the graph represents an observation from the data set.

Front

What does the line of best fit represent in a scatter plot?

Back

The line of best fit is a straight line that best represents the data on a scatter plot. It shows the general direction of the data points and can be used to make predictions.

Front

How do you calculate the slope (m) of a line given two points (x1, y1) and (x2, y2)?

Back

The slope (m) is calculated using the formula: m = (y2 - y1) / (x2 - x1).

Front

What is the formula for the equation of a line in slope-intercept form?

Back

The equation of a line in slope-intercept form is given by: y = mx + b, where m is the slope and b is the y-intercept.

Front

What is the mean absolute deviation (MAD)?

Back

The mean absolute deviation is a measure of the dispersion of a set of data points. It is calculated by taking the average of the absolute differences between each data point and the mean of the data set.

Front

How do you find the mean of a set of numbers?

Back

To find the mean, add all the numbers together and then divide by the total count of the numbers.

Front

What is the purpose of using a line of best fit in statistics?

Back

The line of best fit helps to summarize the relationship between two variables and can be used for making predictions based on the data.

Front

What does a positive slope indicate about a line?

Back

A positive slope indicates that as one variable increases, the other variable also increases.

Front

What does a negative slope indicate about a line?

Back

A negative slope indicates that as one variable increases, the other variable decreases.

Front

What is the y-intercept in the equation of a line?

Back

The y-intercept is the point where the line crosses the y-axis, represented by the value of y when x = 0.