
Stats
Flashcard
•
Mathematics
•
12th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What does the standard deviation (s) represent in a regression analysis?
Back
The typical distance of the activity level ratings from the least-squares line.
2.
FLASHCARD QUESTION
Front
What is the 20th percentile in a data set?
Back
The value below which 20% of the data falls.
3.
FLASHCARD QUESTION
Front
If a soft-drink machine discharges an average of x ounces, what does the standard deviation indicate?
Back
The variability of the fill amounts around the average.
4.
FLASHCARD QUESTION
Front
How does changing the x and y variables in a scatterplot affect the correlation?
Back
The correlation remains the same; only the interpretation of the relationship changes.
5.
FLASHCARD QUESTION
Front
What is the purpose of a least-squares regression line?
Back
To minimize the sum of the squares of the vertical distances of the points from the line.
6.
FLASHCARD QUESTION
Front
What does a higher standard deviation indicate about a data set?
Back
Greater variability or spread in the data.
7.
FLASHCARD QUESTION
Front
What is the formula for calculating the z-score?
Back
z = (X - μ) / σ, where X is the value, μ is the mean, and σ is the standard deviation.
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