What is a correlation coefficient?
Stats Test 3 Review

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Mathematics
•
11th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A statistical measure that describes the strength and direction of a relationship between two variables, ranging from -1 to 1.
2.
FLASHCARD QUESTION
Front
What does a correlation coefficient close to zero indicate?
Back
It indicates a weak or no linear relationship between the two variables.
3.
FLASHCARD QUESTION
Front
What effect does changing the units of measurement have on correlation?
Back
No Change; correlation is a unitless measure.
4.
FLASHCARD QUESTION
Front
What is the shape of a distribution for salaries in a city?
Back
Skewed Right; typically, a few high salaries pull the mean to the right.
5.
FLASHCARD QUESTION
Front
What percent of scores fall within one standard deviation of the mean in a normal distribution?
Back
Approximately 68%.
6.
FLASHCARD QUESTION
Front
What is the formula to calculate an index number?
Back
Index Number = (Current Value / Base Value) x 100.
7.
FLASHCARD QUESTION
Front
If the mean is 100 and the standard deviation is 20, what is the range for one standard deviation?
Back
80 to 120.
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