Algebra 1 Stats Test Fall 2024

Front

What is a correlation coefficient?

Back

A correlation coefficient is a statistical measure that describes the strength and direction of a relationship between two variables. It ranges from -1 to 1.

Front

What does a correlation coefficient of r = -0.95 indicate?

Back

It indicates a strong negative correlation, meaning that as one variable increases, the other variable tends to decrease.

Front

What does a correlation coefficient of r = 0.8 indicate?

Back

It indicates a strong positive correlation, meaning that as one variable increases, the other variable also tends to increase.

Front

What is the empirical rule in statistics?

Back

The empirical rule states that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean, 95% within two standard deviations, and 99.7% within three standard deviations.

Front

What is the interquartile range (IQR)?

Back

The interquartile range (IQR) is a measure of statistical dispersion, calculated as the difference between the third quartile (Q3) and the first quartile (Q1). It represents the range of the middle 50% of the data.

Front

What is a scatter plot?

Back

A scatter plot is a graph that shows the relationship between two quantitative variables, with one variable plotted along the x-axis and the other along the y-axis.

Front

What does a strong positive trend in a scatter plot indicate?

Back

A strong positive trend indicates that as one variable increases, the other variable also tends to increase significantly.

Front

What is the mean of a data set?

Back

The mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.

Front

What is the median of a data set?

Back

The median is the middle value of a data set when the numbers are arranged in ascending order. If there is an even number of values, the median is the average of the two middle numbers.

Front

What is a percentile?

Back

A percentile is a measure used in statistics indicating the value below which a given percentage of observations in a group of observations falls.