Measures of Central Tendency of Data Flashcards

1
Q

What is mean (arithmetic mean)?

A

the average of all data points

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2
Q

What is the formula for mean?

A

(x1 + x2 + x3 + … + xn)/n, or ∑x/n, or add all the data points together and divide by the number of values there are.

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3
Q

What is ∑?

A

a greek letter called “sigma”, which means “sum of…”

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4
Q

What is the formula for weighted average?

A

a * m + b * n + c * p–/m + n + p–, where a, b, and c are mean values of sets A, B, and C, and m, n, and p are number of data points in the respective set.

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5
Q

What are the requirements for calculating weighted average?

A

If there are two or more sets with different amount of data points

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6
Q

What is median?

A

the middle data point after arranging all data points in ascending or descending order

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7
Q

How do you find the median of an even number of data points?

A

You take the average of the middle two data points

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8
Q

Is median sensitive to outlier data points?

A

No

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9
Q

What is the best representative of the central location of data?

A

the median

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10
Q

What is mode?

A

The most occurring data points; the data point with the most frequency of repetition

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11
Q

What is range?

A

the difference between the maximum and minimum data points

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12
Q

What is the lower quartile?

A

25% of the data points are below this data point

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13
Q

What is the upper quartile?

A

25% of the data points are above this data point

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14
Q

What is standard deviation?

A

a measure of the spread of the data points around the mean value

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