Question

can someone help me and explain how to find the sample mean of a sample of a population, given the population mean and standard deviation

Answer 1

oh
so easy
i can help

Answer 2

what exactlyy do you need help on ? can you give me a specific problem ? or something... or do you want to define what each thing is?!?!?!?!

Answer 3

oh nevermind, i got it. thank you though :) but perhaps you can help me on a different question where i have to construct a 90% confidence level?

Answer 4

OHH SO EASY

Answer 5

sorry i just learned this... and im really happy i know how to do it

Answer 6

do you have a confidence interval sheet?

Answer 7

it's okay! lol, i'm learning this stuff now and i have a midterm on monday so i'm trying to study and everything :/

Answer 8

if by the sheet you mean a t table?

Answer 9

what does your table look like?

Answer 10

it has a list of decimals and on the right and left sides, it has im guessing the degree factors and at the bottom it says confidence levels, 80, 90, 95, 98 and 99%

Answer 11

YESS

Answer 12

do you have the rest of the question or is it just saying find the confidence interval of 90%?

Answer 13

the question says Catherine is evaluating consumer acceptance of a new toothpaste package. She randomly selects a sample of 200 households. 40 households prefer the new package. construct a 90% confidence interval for the population proportion of households that prefer the new package

Answer 14

By the way there are TWO main rules you need to know when constructing a confidence interval the 1st rule is that when you don't know the sample size, you use Z* !! and the second rules is you aren't PROVIDED WITH A SAMPLE SIZE, you use a p hat ( a p with a ^ on top) of .5

Answer 15

i'm sorry, in plain terms, what is the p hat of .5 suppose to represent?

Answer 16

The proportion, p-hat of the member of a sample with certain characteristic(s)

Answer 17

so the proportion, p-hat would be 40/200 in this problem, correct?

Answer 18

yes, give me a sec

Answer 19

oh
P hat

Answer 20

okay, thank you so much for replying and helping.

Answer 21

is the probability of a sample i think..

Answer 22

do you want to see my notes?

Answer 23

i have confidence testing notes
that include examples

Answer 24

yes please, it would be such a big help

Answer 25

okay, i'm pretty sure there accurate and if they aren't KHANACADEMY FTW !

Answer 26

he's on youtube great videos and examples.

Answer 27

gotcha. thank you sooo much

Answer 28

alright im uploading them now

Answer 29

this might work as well http://www.pindling.org/Math/Stat/Chap8.htm http://www.dummies.com/how-to/content/statistics-for-dummies-cheat-sheet.html

Answer 30

thank you soso much!!

Answer 31

some of the pictures may not be crystal clear so when you look at them save the picture and open it and scroll to zoom in a little !

Answer 32

thank you :))

Answer 33

and no problem :) !!!!