Statistics Flashcards

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1
Q

Descriptive Statistics

A

Summarises data with numbers and diagrams and describes the data.

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2
Q

Inferential Statistics

A

Draw conclusions and predictions about whole population.

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3
Q

Weighted Average

A

Multiply the number by the amount of times it shows up instead of just constantly adding the same number.

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4
Q

Sample Standard Deviation

A

Sqrt(1/n-1*(sum(number-average)^2))

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5
Q

Reversal Curse

A

AI can prove A = B, but not B = A.

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6
Q

Should I use the mean?

A

Easy to calculate but deceptive.

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7
Q

Should I use the median?

A

Good for skewed distributions (when data is one sided) but does not always belong to the sample (even amount of data for example results in a result which is not in sample)

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8
Q

Should I use mode?

A

Always belongs in the sample but can be inaccurate when determining the centre of the sample set.

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9
Q

Geometric Mean

A

(Product(a_i))^1/n
The geometric mean is always smaller than the arithmetic mean.

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10
Q

Quartiles

A

1st Quartile -> median between beginning of sample and median.
2nd Quartile -> the median.
3rd Quartile -> median between the median and the end of the sample.

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11
Q

Interquartile Range

A

Found by subtracting the third quartile from the first.

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