SAT Math Prep

What is the significance of the y-intercept in a linear equation?

• It represents the slope of the line.

• It indicates the value of y when x = 0.

• It shows the maximum value of y in the equation.

• It is the point where the line crosses the x-axis.

What does it mean if a scatter plot shows no correlation?

• There is a strong positive relationship between the two variables.

• There is a strong negative relationship between the two variables.

• There is no discernible relationship between the two variables.

• The two variables are perfectly correlated.

What is the equation of a line with a negative slope that intersects the y-axis at 2?

• y = -x + 2

• y = x + 2

• y = -2x + 2

• y = 2x - 2

What does it mean for a line to be an accurate line estimate of best fit?

• It means the line closely represents the trend of the data points in a scatter plot.

• It means the line intersects all data points perfectly.

• It means the line is horizontal and shows no trend.

• It means the line is vertical and indicates a strong correlation.

How can you identify a nonlinear association in a scatter plot?

• The data points form a straight line.

• The data points do not form a straight line and may curve or cluster.

• The data points are all located at the origin.

• The data points are evenly spaced along the x-axis.

How do you determine if two ratios form a proportion?

• Add the ratios together and see if the sum is equal.

• Cross-multiply the ratios and see if the products are equal.

• Subtract the smaller ratio from the larger one and check if the difference is zero.

• Multiply both ratios by the same number and see if they remain equal.

What is a proportion?

• A proportion is an equation that states that two ratios are equal.

• A proportion is a type of fraction that represents a part of a whole.

• A proportion is a mathematical term for a percentage.

• A proportion is a method of solving linear equations.

What type of correlation is indicated by a downward sloping scatter plot?

• Positive correlation

• No correlation

• Negative correlation

• Strong correlation

What does a positive correlation in a scatter plot indicate?

• As one variable increases, the other variable also increases.

• As one variable increases, the other variable decreases.

• There is no relationship between the two variables.

• The two variables are completely unrelated.

If a data set has a median of 25 and a range of 40, how do you find the maximum value?

• Add the range to the median: 25 + 20 = 45.

• Subtract the range from the median: 25 - 20 = 5.

• Multiply the median by the range: 25 * 40 = 1000.

• Divide the range by the median: 40 / 25 = 1.6.