Statistics Midterm Review

Front

What is a scatter plot?

Back

A scatter plot is a graph that shows the relationship between two quantitative variables by displaying data points on a two-dimensional grid.

Front

How do you interpret a trend line in a scatter plot?

Back

A trend line indicates the general direction of the data points. It can be used to make predictions about one variable based on the other.

Front

What is the interquartile range (IQR)?

Back

The interquartile range 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 does the slope of a linear regression equation represent?

Back

The slope indicates the rate of change of the dependent variable for each unit change in the independent variable. For example, in the equation y = 1.5x + 12, the slope of 1.5 means that for each additional unit of x, y increases by 1.5.

Front

Which measure of center is affected by outliers?

Back

The mean is affected by outliers, as it takes into account all values in the dataset.

Front

What is the median?

Back

The median is the middle value of a dataset when the numbers are arranged in order. If there is an even number of observations, the median is the average of the two middle numbers.

Front

What is the mode?

Back

The mode is the value that appears most frequently in a dataset.

Front

How do you find the mean of a dataset?

Back

To find the mean, add all the values together and then divide by the number of values.

Front

What is a linear regression equation?

Back

A linear regression equation models the relationship between two variables by fitting a linear equation to the observed data.

Front

What does it mean if a scatter plot shows a negative correlation?

Back

A negative correlation means that as one variable increases, the other variable tends to decrease.