Question

I am given a sample size of 469, 95% confidence of 0.006, 0.026. How do I find the sample proportion?

I have statcrunch and I'm pretty good at excel.

Answer 1

@UnkleRhaukus ?

Answer 2

Statistics?

Answer 3

Yep

Answer 4

Yeah. The last class I'll ever have to take.

Answer 5

Oh God. I feel ya. I had to take stats last semester. Sorry I lied. Actually spring semester my bad. Summer i took physics.

Answer 6

Any idea where I should go with this question? I'm at a loss.

Answer 7

Is this the z-scores that you're doing?

Answer 8

I think it's related to that or critical values?

Answer 9

I think I need to use the confidence interval and sample size to determine the sample proportion but I'm not sure which formula to look at

Answer 10

Which ones do you have? Because I used a stats tool that I've been provided at my college...

Answer 11

statcrunch?

Answer 12

Yes!

Answer 13

Yeah that's what I'm using as well.

Answer 14

Ok remember how to do the Confidence of interval or something like that??

Answer 15

Oh boo! I remember lol!
Plug in your sample size is S
Plug in .95 as the confidence

Answer 16

Yeah, I have the one sample z summary open right now. But it wants sample mean and sample standard dev which I dont have

Answer 17

you're probably at the wrong one

Answer 18

One sample z confidence interval is throwing out some errors at me.

Answer 19

var1 n Sample Mean Std. Err. L. Limit U. Limit
269 1 269 NaN NaN NaN

Answer 20

Hold on. Lemme see if I can pull mine up

Answer 21

I feel like I need to find the mean or standard deviation for this. K!

Answer 22

I don't think so. I can't pull up my statcrunch. Like try aall the options they have on there

Answer 23

I think I found it? Should I be using t-stats since I don't know the sample mean?

Answer 24

Go to
Stat
Proportion
One sample
with summary
TRY THAT

Answer 25

My bad. It's not that I don't think. Yes it might be t stats. Try it all out

Answer 26

Does this make sense?

Answer 27

Then the sample proportion would be 469/38419?

Answer 28

Change the sample size to what you're given in the question...

Answer 29

that gives me a width of 0.18147477, I don't know what to do with that.

Answer 30

Did you change the sample size

Answer 31

http://jwilson.coe.uga.edu/emt668/EMAT6680.2001/Sikes/emat6690/instructional%20unit/image134.gif

(0.006, 0.026)

The sample prop. is right in the centre of those two numbers.

Answer 32

(0.026 + 0.006)/2 = 0.013

Answer 33

Thank you!. I think I fundamentally misunderstand what the two numbers for a confidence interval mean?

Answer 34

Also that should be 0.016 I think

Answer 35

Yeah it's 0.016.

Means you are 95% confident that the true population mean is in that range.

The sample prop. is right in the middle. The plus or minus part is the margin of error.

Answer 36

Plus or minus part?

Answer 37

in http://jwilson.coe.uga.edu/emt668/EMAT6680.2001/Sikes/emat6690/instructional%20unit/image134.gif

Answer 38

OH

Answer 39

Thanks a bunch!

Answer 40

Welcome.