Statistics - SAT Math
Card 0 of 99
What is the mean?
What is the mean?
The average: $\text{mean} = \frac{\text{sum of all values}}{\text{number of values}}$.
The average: $\text{mean} = \frac{\text{sum of all values}}{\text{number of values}}$.
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What is the median?
What is the median?
The middle value when data are ordered.
The middle value when data are ordered.
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What is the mode?
What is the mode?
The most frequently occurring value.
The most frequently occurring value.
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Which measure of center is most affected by outliers?
Which measure of center is most affected by outliers?
The mean.
The mean.
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If data are symmetric, how do mean and median compare?
If data are symmetric, how do mean and median compare?
They are approximately equal.
They are approximately equal.
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If data are skewed right, which is larger: mean or median?
If data are skewed right, which is larger: mean or median?
The mean is greater than the median.
The mean is greater than the median.
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If data are skewed left, which is larger: mean or median?
If data are skewed left, which is larger: mean or median?
The median is greater than the mean.
The median is greater than the mean.
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How do you calculate the range?
How do you calculate the range?
$\text{Range} = \text{maximum} - \text{minimum}$.
$\text{Range} = \text{maximum} - \text{minimum}$.
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What is interquartile range (IQR)?
What is interquartile range (IQR)?
$\text{IQR} = Q_3 - Q_1$.
$\text{IQR} = Q_3 - Q_1$.
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What is the definition of variance?
What is the definition of variance?
Average squared deviation from the mean.
Average squared deviation from the mean.
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What is the definition of standard deviation?
What is the definition of standard deviation?
Square root of variance; measures average distance from mean.
Square root of variance; measures average distance from mean.
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If data have a large standard deviation, what does that indicate?
If data have a large standard deviation, what does that indicate?
The data are more spread out from the mean.
The data are more spread out from the mean.
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If data have a small standard deviation, what does that indicate?
If data have a small standard deviation, what does that indicate?
The data are tightly clustered around the mean.
The data are tightly clustered around the mean.
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How is IQR affected by outliers?
How is IQR affected by outliers?
Less affected than range or standard deviation.
Less affected than range or standard deviation.
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Describe a symmetric distribution.
Describe a symmetric distribution.
Left and right sides are mirror images.
Left and right sides are mirror images.
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Describe a skewed-right distribution.
Describe a skewed-right distribution.
Tail extends to the right (high values).
Tail extends to the right (high values).
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Describe a skewed-left distribution.
Describe a skewed-left distribution.
Tail extends to the left (low values).
Tail extends to the left (low values).
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Which measure of center best represents skewed data?
Which measure of center best represents skewed data?
The median.
The median.
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Which measure of center best represents symmetric data?
Which measure of center best represents symmetric data?
The mean.
The mean.
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How does range describe data spread?
How does range describe data spread?
It measures the total span of the data set.
It measures the total span of the data set.
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