Test Review Stats

Front

What is the definition of median in statistics?

Back

The median is the middle value in a list of numbers sorted in ascending order. If there is an even number of observations, the median is the average of the two middle numbers.

Front

How do you find the median of a set of numbers?

Back

1. Arrange the numbers in ascending order. 2. If the count of numbers is odd, the median is the middle number. 3. If the count is even, the median is the average of the two middle numbers.

Front

What does a scatter plot represent?

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 is a positive correlation in a scatter plot?

Back

A positive correlation occurs when an increase in one variable corresponds to an increase in another variable, resulting in an upward trend in the scatter plot.

Front

What is a negative correlation in a scatter plot?

Back

A negative correlation occurs when an increase in one variable corresponds to a decrease in another variable, resulting in a downward trend in the scatter plot.

Front

What does 'no correlation' mean in statistics?

Back

No correlation means there is no discernible relationship between two variables; changes in one variable do not predict changes in the other.

Front

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

Back

A trend line indicates the general direction of the data points in a scatter plot, helping to predict values based on the observed relationship.

Front

What is the purpose of using a scatter plot?

Back

Scatter plots are used to visually assess the relationship between two variables, identify trends, and detect outliers.

Front

What is the definition of correlation in statistics?

Back

Correlation is a statistical measure that describes the extent to which two variables change together.

Front

What is the range of values for correlation coefficients?

Back

Correlation coefficients range from -1 to 1, where -1 indicates a perfect negative correlation, 0 indicates no correlation, and 1 indicates a perfect positive correlation.