Flashcard--Analyzing Two-Variable Data

Front

What is an outlier in a data set?

Back

An outlier is a data point that differs significantly from other observations in a dataset, often indicating variability in measurement or a possible experimental error.

Front

What does a correlation coefficient (r) of -0.3 indicate?

Back

It indicates a weak negative correlation between the two variables, meaning as one variable increases, the other tends to decrease slightly.

Front

What can be inferred if the segmented bar for one variable shows significantly different segment sizes than another?

Back

The variables are associated, indicating a relationship between them.

Front

What does a segmented bar graph visually illustrate?

Back

It illustrates the proportion of each category within a variable, showing how different segments contribute to the whole.

Front

What does a correlation coefficient of 0.92 signify in the context of studying and grades?

Back

It signifies a strong positive correlation, meaning that as the number of hours studied increases, grades tend to increase significantly.

Front

Define correlation in the context of two-variable data analysis.

Back

Correlation is a statistical measure that describes the extent to which two variables change together, indicating the strength and direction of their relationship.

Front

What is the difference between positive and negative correlation?

Back

Positive correlation means that as one variable increases, the other also increases, while negative correlation means that as one variable increases, the other decreases.

Front

What is a segmented bar graph used for?

Back

A segmented bar graph is used to compare the proportions of different categories within a single variable across different groups.

Front

What does it mean if two variables are independent?

Back

It means that the change in one variable does not affect the change in the other variable; there is no relationship between them.

Front

How can you identify an outlier in a scatter plot?

Back

An outlier can be identified as a point that is distant from the overall pattern of data points in the scatter plot.