Data Science Unit 1-3 Review

Front

What is a scatterplot?

Back

A scatterplot is a type of graph that displays values for typically two variables for a set of data. Each point represents an observation in the dataset.

Front

What does correlation mean in data science?

Back

Correlation refers to a statistical measure that describes the extent to which two variables change together. A positive correlation means that as one variable increases, the other tends to increase, and vice versa.

Front

What is a histogram?

Back

A histogram is a graphical representation of the distribution of numerical data, showing the number of data points that fall within specified ranges (bins).

Front

What is the difference between weak and strong correlation?

Back

Weak correlation indicates a slight relationship between two variables, while strong correlation indicates a strong relationship where changes in one variable significantly affect the other.

Front

What does a correlation coefficient of 0 indicate?

Back

A correlation coefficient of 0 indicates no correlation between the two variables, meaning changes in one variable do not predict changes in the other.

Front

How do you calculate the mean of a set of numbers?

Back

To calculate the mean, add all the numbers together and then divide by the total count of numbers.

Front

What is the purpose of data visualization?

Back

Data visualization helps to present data in a visual context, making it easier to identify patterns, trends, and insights.

Front

What is the difference between a bar graph and a histogram?

Back

A bar graph displays categorical data with rectangular bars, while a histogram displays the distribution of numerical data using bins.

Front

What does a positive correlation look like on a scatterplot?

Back

A positive correlation on a scatterplot appears as a pattern where points trend upwards from left to right.

Front

What is a line plot?

Back

A line plot is a type of graph that displays data points in a time series or sequence, connecting them with lines to show trends over time.