normal distribution

Question 1

normal distribution

Answer 1

mean and VARIANCE

Question 2

what is variance

Answer 2

STANDARD DEVIATION SQUARED

Question 3

what data is normal distribution for

Answer 3

continuous

Question 4

are under curve for normal

Answer 4

1

Question 5

how to find probability between 2 values

Answer 5

find area under the curve between those 2 values

Question 6

how much data approx lies within 1 standard deviation either side

Answer 6

68%

Question 7

how much data approx lies within 2 standard deviation either side

Answer 7

95%

Question 8

how much data approx lies within 3 standard deviation either side

Answer 8

99.7%

Question 9

how many standard deviations does 100% of the data approx lie within

Answer 9

3 standard deviations either side

Question 10

inverse normal

Answer 10

IS ONLY LESS THAN

Question 11

make sure you can do all

Answer 11

Question 12

standard normal

Answer 12

Question 13

what is a Z score

Answer 13

how many standard deviations above / below the mean

Question 14

when can you approximate a binomial to a normal

Answer 14

if n is large

if p is close to 0.5

Question 15

approximating a binomial formula

Answer 15

Question 16

how can you tell if its appropriate to use the normal distribution from a graph

Answer 16

as sample size increases. shape of distribution should look more and more ‘normal’ - like a bell curve

Question 17

difference between sigma and s

Answer 17

sigma - population standard deviation

s - sample standard deviation

its like when you use your calculator to find standard deviation - you use s not sigma