Algebra 1A - Module 4B Review

Flashcard
•
Mathematics
•
9th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a residual plot?
Back
A residual plot is a graph that shows the residuals on the vertical axis and the independent variable on the horizontal axis. It helps to assess the fit of a regression model.
2.
FLASHCARD QUESTION
Front
When is a linear regression model appropriate?
Back
A linear regression model is appropriate when the residual plot shows no patterns, indicating that the relationship between the variables is linear.
3.
FLASHCARD QUESTION
Front
What does a correlation of 0 indicate?
Back
A correlation of 0 indicates no correlation between the two variables, meaning changes in one variable do not predict changes in the other.
4.
FLASHCARD QUESTION
Front
What does a strong negative correlation (e.g., r = -0.87) imply?
Back
A strong negative correlation implies that as one variable increases, the other variable tends to decrease significantly.
5.
FLASHCARD QUESTION
Front
What does a weak positive correlation (e.g., r = 0.3) imply?
Back
A weak positive correlation implies that there is a slight tendency for one variable to increase as the other variable increases, but the relationship is not strong.
6.
FLASHCARD QUESTION
Front
How do you calculate expected earnings based on hours worked?
Back
Expected earnings can be calculated by multiplying the hourly wage by the number of hours worked.
7.
FLASHCARD QUESTION
Front
What is the formula for correlation coefficient (r)?
Back
The correlation coefficient (r) is calculated using the formula: r = (nΣxy - ΣxΣy) / sqrt[(nΣx^2 - (Σx)^2)(nΣy^2 - (Σy)^2)], where n is the number of pairs.
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