What is an influential observation in a dataset?
Correlation and Regression 2

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•
Mathematics
•
10th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
An influential observation is an outlier in the x direction that can significantly affect the slope of the regression line.
2.
FLASHCARD QUESTION
Front
What is a residual in regression analysis?
Back
A residual is the difference between the observed y-value and the predicted y-value in a linear regression model.
3.
FLASHCARD QUESTION
Front
What does a correlation coefficient of r = 0 indicate?
Back
A correlation coefficient of r = 0 indicates no correlation between the variables.
4.
FLASHCARD QUESTION
Front
What does a positive association in a scatter plot indicate?
Back
A positive association indicates that as one variable increases, the other variable also tends to increase.
5.
FLASHCARD QUESTION
Front
Estimate the correlation coefficient for a scatterplot with a strong negative trend.
Back
r = -0.9 indicates a strong negative correlation.
6.
FLASHCARD QUESTION
Front
What is the purpose of a least squares regression line (LSRL)?
Back
The LSRL minimizes the sum of the squares of the residuals, providing the best fit line for the data.
7.
FLASHCARD QUESTION
Front
What does a negative correlation coefficient signify?
Back
A negative correlation coefficient signifies that as one variable increases, the other variable tends to decrease.
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