Question

In a study of 304 adults, only three wanted to go to college

Answer 1

@rock_mit182 @explorerhills

Answer 2

i got C, but again not sure

Answer 3

@reese.jordan @MrNood

Answer 4

@AloneS

Answer 5

damn... i need to study this as well for chemistry :/

Answer 6

It's not C

Do yo uknow th eformula to work out the CI?

You have the population size, mean and SD

that is all you need to work out the confidence interval

Answer 7

If oyu don't have it in your study notes then you can find it here:

https://en.wikipedia.org/wiki/Confidence_interval

Answer 8

Mr nood, what is the formula for this ?

Answer 9

@rock_mit182 @mrnood help still? Im confused...

Answer 10

You are studying confidence intervals evidently.

There is a formula to work it out given the population, the SD and the mean.

Since you are studying it I guess the formula MUST be in your text or study books. If not then it is in the link Iposted above.

Look up the formula, and use the data you have to work out th einterval.

Answer 11

@MrNood I don't exactly know the formula.. this whole problem confused me a great deal. I worked it out before and got C but I'm still not sure

Answer 12

@welshfella

Answer 13

@ace-n-it

Answer 14

sorry - I've forgotten most of this stuff.

Answer 15

x-bar is the sample mean
z is the confidence interval z-value (1.96 in this case)
s is standard deviation
n is sample size

Answer 16

i got C as my answer... do you know if that would be correct? @Vocaloid

Answer 17

hm, i used an online calculator and got something different slightly

Answer 18

you might have used the t-formula instead of the z-formula

Answer 19

aw no, could you please explain to me how you did it?

Answer 20

75 +- (1.96)*8/sqrt(205)

Answer 21

yup!

Answer 22

remember that you use the z-table value if n >= 30

Answer 23

for a confidence interval of 95%, z = 1.96

Answer 24

oh wow thanks! I noticed i did use the wrong formula..

Answer 25

can you help me with one more? @Vocaloid