Thursday 11/7/2024 Review

Front

What is an irrational number?

Back

Front

What is the slope of a line perpendicular to the line y = mx + b?

Back

The slope of a line perpendicular to another line with slope m is -1/m.

Front

What is correlation?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. A positive correlation means that as one variable increases, the other also increases, while a negative correlation means that as one variable increases, the other decreases.

Front

How do you find the correlation coefficient?

Back

The correlation coefficient (r) can be calculated using the formula: r = (nΣxy - ΣxΣy) / sqrt[(nΣx^2 - (Σx)^2)(nΣy^2 - (Σy)^2)], where n is the number of pairs, Σxy is the sum of the product of paired scores, Σx is the sum of x scores, and Σy is the sum of y scores.

Front

What is a system of equations?

Back

A system of equations is a set of two or more equations with the same variables. The solution is the set of values that satisfy all equations in the system.

Front

What does it mean for two lines to be perpendicular?

Back

Two lines are perpendicular if the product of their slopes is -1.

Front

What is the formula for the sum of two numbers?

Back

If p and x are two numbers, the sum can be expressed as: p + x = total.

Front

What is the difference between correlation and causation?

Back

Correlation indicates a relationship between two variables, while causation implies that one variable directly affects the other.

Front

What is the significance of a correlation coefficient of 1 or -1?

Back

A correlation coefficient of 1 indicates a perfect positive correlation, while -1 indicates a perfect negative correlation.

Front

How do you interpret a correlation coefficient of 0?

Back

A correlation coefficient of 0 indicates no correlation between the two variables.