Statistics Review
Flashcard
•
Mathematics
•
9th Grade
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What does a correlation coefficient (r) of -0.87 indicate?
Back
A strong negative correlation between two variables.
2.
FLASHCARD QUESTION
Front
What is the equation of a linear regression line?
Back
y = mx + b, where m is the slope and b is the y-intercept.
3.
FLASHCARD QUESTION
Front
If a team practices 4.5 hours per week, how can we predict the number of matches they will win using the equation y = 3.14x + 3.52?
Back
Substitute x with 4.5: y = 3.14(4.5) + 3.52 = about 18.
4.
FLASHCARD QUESTION
Front
What does a correlation coefficient (r) of 0.913 signify?
Back
There is a strong positive correlation between the number of years of education and annual salary.
5.
FLASHCARD QUESTION
Front
What percentage of students have less than 1,000 songs on their MP3 players if the answer is 20%?
Back
20% of students have less than 1,000 songs.
6.
FLASHCARD QUESTION
Front
Define 'correlation coefficient'.
Back
A statistical measure that describes the strength and direction of a relationship between two variables.
7.
FLASHCARD QUESTION
Front
What is the range of values for a correlation coefficient?
Back
The range is from -1 to 1.
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