normal distribution

Question 1

what is normal ditrubtion for

Answer 1

continous random variables, ~Y
(indefinite amount of value)
Like time take for driver to drive to NYC

Question 2

normal ditrubution notation

Answer 2

Y~N(u, @^2)

Question 3

where is the point of infelction in normal distrubtion

Answer 3

u-@
u+@

Question 4

what percentage of data is withioin 1,2 or 3 standard deviation of the mean

Answer 4

1- 68%
2- 95%
3- 99.7%

Question 5

finding probabilities and inverse normal

Answer 5

know your calculator
will calcualte < only

Question 6

standard normal distribution notation

Answer 6

Z~N (0,1^2)

Question 7

how to code to make it become standard notmsal distribution

Answer 7

Z=Y-u/@

Question 8

if you are missing u or @ or both then

Answer 8

use coding Z=Y-u/@ and then if both missing do simualtaoeus equation

Question 9

approximate binomial distribution as normal distributions conditions

Answer 9

if n is large
if p is close 0.5

Question 10

approximate binomial distribution as normal distributions working out u and @

Answer 10

u = np
@ = root of (np(1-p))

Question 11

what must you do if approximate binomial distribution as normal distribution

Answer 11

contiuously correction
(make range larger by 0.5 either end )