Probibility and Stats

Question 1

What is the Mean?

Answer 1

Sum of set values over the count of set items. A.K.A., the average.

Question 2

What is an Integer?

Answer 2

A negative, zero, or positive number with no fraction or decimal component.

Question 3

Moving from data towards a model is?

Answer 3

Statistics.

Question 4

Moving from a model towards data is?

Answer 4

Probability.

Question 5

What is P?

Answer 5

The “P-value”

Question 6

P(A or B) = ?

Answer 6

P(A) + P(B) - P(A and B)

Question 7

P(A|B) = ?

Answer 7

P(A and B)/P(B)

Question 8

Law of Total Probability?

Answer 8

P(A) = P(A and B) + P(A and not B)

Question 9

Bayes’s Therom = ?

Answer 9

P(A|B) = [ P(B|A) / P(B) ] x [ P(A) ]

Which tells us how to update the initial probability of event A as we gather new information B.

Question 10

P(A) = ?

Answer 10

= P(A and B) + P(A and not B).

Question 11

Two events, A and B, are independent if, and only if ?

Answer 11

P(A and B) = P(A) x P(B)

Question 12

If events, A and B, are dependent, then

Answer 12

P(A and B) = P(A|B) x P(B)

Question 13

P(A and B) = ?

Answer 13

P(A∣B) x P(B)