Statistics (4)

Question 1

Binomial vs Poisson

Answer 1

Bi - FIST
Po - RIPS

Question 2

RIPS

Answer 2

Random event
Independent event
Proportianal
Simotaneous (not)

Question 3

FIST

Answer 3

Fixed # of trials
Independent events
Same probability
Two outcomes only

Question 4

Inverse Poisson

Answer 4

Make x =0 and find the prob
Area = e to the -ve lambda
ln(a) = -lam lin(e)
ln(a) - -ve lam
lam = -ln(a)

Question 5

If binomial has
___ and ____

Answer 5

Multiply the 2 answers

Question 6

Different assumptions

Answer 6

Dependent/Independent
Environments
Picked from a random selection

Question 7

N.D with a min & pax percentage

Answer 7

Find the 2 z-scores
Use the z-score formula
Change it around
Use simotaneous on calc

Question 8

How to find the z-score?

Answer 8

Z = (x-m) / s.d
In inverse
Mean = 0, s.d = 1

Question 9

S.D of triangular

Answer 9

sqrt(a^2+b^2+c^2)+(ab)+(ac)+(bc)
/
18

Question 10

Mean of triangular

Answer 10

a + b + c / 3

Question 11

Mean of rectangular

Answer 11

a + b /2

Question 12

S.D of rectangular

Answer 12

1/sqrt12 x (b-a)

Question 13

If something happens to two people

Answer 13

Square the answer

Question 13

Does a N.D fit?

Answer 13

Symetrical
Bell-shaped
Continuous
Higher or lower than bounds shown
68% in 1, 95% in 2, 99.7% in 3

Question 14

Jusitfy/assumtions for DRV

Answer 14

That no value is lesser/greater than what is listed (same for tri & uni)

Question 15

How to find if DRV are independent

Answer 15

VAR(x+y) = var(x) + var(y)