Statistics

Question 1

Descriptive Statistics

Answer 1

Summarises data with numbers and diagrams and describes the data.

Question 2

Inferential Statistics

Answer 2

Draw conclusions and predictions about whole population.

Question 3

Weighted Average

Answer 3

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

Question 4

Sample Standard Deviation

Answer 4

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

Question 5

Reversal Curse

Answer 5

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

Question 6

Should I use the mean?

Answer 6

Easy to calculate but deceptive.

Question 7

Should I use the median?

Answer 7

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)

Question 8

Should I use mode?

Answer 8

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

Question 9

Geometric Mean

Answer 9

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

Question 10

Quartiles

Answer 10

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.

Question 11

Interquartile Range

Answer 11

Found by subtracting the third quartile from the first.