Descriptive Statistics Review

Front

What is the least squares regression equation?

Back

A statistical method used to determine the line of best fit for a set of data points by minimizing the sum of the squares of the vertical distances of the points from the line.

Front

How do you predict a value using a regression equation?

Back

Substitute the known value into the regression equation to calculate the predicted value.

Front

What is the best way to display the relationship between two categorical variables?

Back

A two-way table or side by side boxplots can be used to display the relationship.

Front

What is a boxplot?

Back

A graphical representation of the distribution of data based on a five-number summary: minimum, first quartile (Q1), median, third quartile (Q3), and maximum.

Front

What does it mean if a distribution is skewed?

Back

A skewed distribution is one where the data points are not symmetrically distributed around the mean, leading to a longer tail on one side.

Front

What is the interquartile range (IQR)?

Back

The 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 the difference between an observational study and a designed experiment?

Back

An observational study observes subjects without manipulation, while a designed experiment involves the researcher actively manipulating variables to observe effects.

Front

What is a scatterplot?

Back

A scatterplot is a graph that displays values for typically two variables for a set of data, showing the relationship between them.

Front

What is the purpose of descriptive statistics?

Back

Descriptive statistics summarize and describe the main features of a dataset, providing simple summaries about the sample and measures.

Front

What is the mean?

Back

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