Distribution

Question 1

What is Binomial distribution?

Answer 1

Probability of occurrence for two mutually exclusive events and the probability of complement is 1-p.

P(k)= (n!/ k!(n-k)!) x p^k (1-p)^n-k
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(Probability of order. (Probability of
of event occurrence) not occurring )

N= total number of cases
K=number of observed cases
p^k=probability of elemental event

Question 2

What is poison distribution?

Answer 2

Events with known probability occurring in fixed time period.

Coin toss tree
HHH- 1/2 x 1/2 x 1/2 =1/8

P here is 1/2
N is 3(HHH)

Question 3

What is ‘AND’ & ‘OR’ rule?

Answer 3

And is independent events (multiply)
Or is mutually exclusive events (+)
•If order doesn’t matter use OR rule

Question 4

What is p on a stick chart?

Answer 4

If it is higher on the right - p<1/2
To the left - p>1/2

Question 5

Central limit theorem?

Answer 5

When sum of independent variables is normally distributed

Question 6

What do you need to specify shape of normal distribution?

Answer 6

Mean and SD

Question 7

Difference between t and normal distribution?

Answer 7

Less data amount in t distribution and more skewed.