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3 cards from this section. Quick, good the night before a test.
Calculate the mean of the following x values: 10, 20, 30, 40.
Add the values together and divide by the number of values.
What does a correlation coefficient of r = 0 imply?
Think about what a value of zero means in terms of direction.
What is the first step in linear regression analysis?
Think about what foundational information we need before analyzing relationships.
True or False: A correlation coefficient of -1 indicates a perfect positive relationship.
Consider the meanings of positive and negative correlations.
Given the data set x: [2, 4, 6, 8, 10] and y: [1, 3, 4, 5, 6], perform a full linear regression analysis including means, standard deviations, r, b coefficients, and the regression equation.
Take it step by step and keep track of your calculations.
Consider two variables with a correlation of -0.25. What does this suggest about the relationship? Explain as if explaining to a class.
Think about what negative correlations imply when visualizing data relationships.
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