Question

anyone really good at statistics? I really need help on last questions!

Answer 1

What's the question?

Answer 2

whats the question

Answer 3

3)
For the following, assume
that all variables are normally distributed and are distributed identically to the population from which they were drawn
.
a)
What is the probability that a person in the population has a “Cooperation with Police ”score higher than 3.23?
b)
What is the probability that a person in the population has a“Self Control ”score less than 3.08?
c)
What is the probability that a person in the population has a School Commitment score higher than 1.87?
d)
What is the probability that a person in the population has
a Trust in Police score less than 3.17
?

Answer 4

I need SD , Z score , and probability

Answer 5

Are you able to find the mean and standard deviation for the "Cooperation with police" ?

Answer 6

i have 3.23-3.625/0.5391

Answer 7

but no sure if thats right

Answer 8

3.625 is the mean of "Cooperation with police " ?

Answer 9

yes I believe

Answer 10

http://www.wolframalpha.com/input/?i=mean+2.25%2C+4%2C+3.25%2C+4%2C4%2C4%2C4%2C3.25%2C2.5%2C3.25%2C3%2C+4%2C+3.25%2C4%2C4%2C4%2C4%2C4%2C4%2C3.75

Answer 11

how did u get 0.5391 ?

Answer 12

http://www.wolframalpha.com/input/?i=standard+deviation+2.25%2C+4%2C+3.25%2C+4%2C4%2C4%2C4%2C3.25%2C2.5%2C3.25%2C3%2C+4%2C+3.25%2C4%2C4%2C4%2C4%2C4%2C4%2C3.75

Answer 13

how would the formula look for A

Answer 14

you have sample statistics,
and you want to estimate population parameter

so Central Limit Theorem kicks in

Answer 15

heard of CLT before ?

Answer 16

no , I have not...

Answer 17

all I know is that to find the probability I need to use the Z score chart?

Answer 18

oh ok, then this is a simple problem
just find the zscore from above

Answer 19

actually you're doing it correctly,
keep going :)

Answer 20

are you sure?

Answer 21

once u have zscore, find the probability from zscore table :
http://www.math.upenn.edu/~chhays/zscoretable.pdf

Answer 22

yes !

Answer 23

is my mean incorrect?

Answer 24

mean is correct :
http://www.wolframalpha.com/input/?i=mean+2.25%2C+4%2C+3.25%2C+4%2C4%2C4%2C4%2C3.25%2C2.5%2C3.25%2C3%2C+4%2C+3.25%2C4%2C4%2C4%2C4%2C4%2C4%2C3.75

Answer 25

ok thank you !

Answer 26

good lukc !