8th Grade STAAR Math Review: Key Concepts and Solutions

The video tutorial covers various mathematical concepts, including calculating mean absolute deviation, analyzing scatter plots, applying the Pythagorean theorem, and solving direct variation problems. It provides step-by-step explanations and examples to help students understand and apply these concepts effectively.

How do you calculate the mean absolute deviation from a given data set?

• Add all data points together and divide by the total number of points.

• Multiply each data point by the mean and then find the average.

• Subtract the smallest data point from the largest and divide by 2.

• Find the mean, then subtract each data point from the mean and average the results.

What is the formula for the mean absolute deviation?

• Mean of the data set minus each data point

• Sum of the absolute values of the differences between each data point and the mean

• Sum of all data points divided by the number of data points

• The largest data point minus the smallest data point

What does a negative association in a scatter plot indicate?

• As one variable increases, the other also increases.

• As one variable decreases, the other also decreases.

• As one variable increases, the other variable decreases.

• There is no relationship between the two variables.

What does a scatter plot with no trend indicate?

• A strong negative correlation

• A strong positive correlation

• No correlation

• Cannot be determined

What is the result of a dilation transformation on a figure?

• The figure changes its size but retains its shape.

• The figure reflects over a line, changing its orientation.

• The figure shifts position without changing its shape or size.

• The figure rotates around a point.

How does compound interest differ from simple interest over time?

• Simple interest remains constant, while compound interest increases.

• Compound interest remains constant, while simple interest increases.

• There is no difference between compound and simple interest.

• Both compound and simple interest decrease over time.

Which transformation does not preserve congruence?

• Dilation

• Translation

• Rotation

• Reflection

What is the primary characteristic of a function?

• Each input maps to exactly one output.

• Each input maps to exactly two outputs.

• Outputs can have multiple inputs.

• Inputs and outputs have no direct relationship.

How do you find the volume of a cylinder?

• Multiply the base area by the height.

• Divide the base area by the height.

• Subtract the base area from the height.

• Add the base area to the height.

Which statement about proportional relationships is true?

• They cannot be represented by a straight line.

• They always pass through the point (1,1).

• They have a variable rate of change.

• They have a constant rate of change.