Question

Will medal if being helped:

The distribution of cholesterol levels in teenage boys is approximately normal with μ = 170
and σ = 30. A random sample of 30 boys in your community has a sample mean cholesterol
level = 190.

Use the applet at http://www.rossmanchance.com/applets/SampleMeans/SampleMeans.html to
design and perform a hypothesis test to see if the boys in our community have an especially
high cholesterol level.

Answer 1

@ganeshie8 @dolphin1998 @friendzone @kevindragonlord @Anaise

Answer 2

@FLVSFT @FLVSKidd @nuttyliaczar

Answer 3

I am srry I am stuck too

Answer 4

I'm not a statistics person, but I'm sure you could look this up

Answer 5

i tried and i got nothing

Answer 6

I tried to

Answer 7

is this a quiz, test exam or what? if it is not any of that you might can ask your teacher for help maybe

Answer 8

its a winter break packet :/

Answer 9

what is that?

Answer 10

a packet that i have to do during my winter break

Answer 11

ohh what school do u go to?

Answer 12

i dont want to say that here due to my privacy, sorry

Answer 13

i gave u madel i don't no y do

Answer 14

thanks i guess lol

Answer 15

it is ok... I medaled him to xd

Answer 16

thx for the medal though @mjmahmood

Answer 17

no problem

Answer 18

@mjmahmood gave you the best response :P

Answer 19

Xd!!!!!

Answer 20

@SolomonZelman can u help?

Answer 21

what's inside the attachment?
I don't think that properly opened for me.

Answer 22

its like a blank page and idk if its my computer

Answer 23

but do you think you can help?

Answer 24

You can make 1 tail, or 2-tail test (just as you prefer to make up)?

Answer 25

what do you mean?

Answer 26

I think it is, but it is for mac I think

Answer 27

He means test as in experiments if I am not mistaken

Answer 28

yeah

Answer 29

Well if this is rated for high school I will be going into high school next year though XD!!!!

Answer 30

lol

Answer 31

good luck!

Answer 32

thx I will also be doing (hopefully) French during summer, and will be going to a college for a class at one of my local colleges next year for nursing.

Answer 33

oh cool

Answer 34

thx!!

Answer 35

np!

Answer 36

Did you just start open study?

Answer 37

me, yeah

Answer 38

cool and to hep you out here u go lol

Answer 39

just fot this packet and yeah!

Answer 40

need help in math too

Answer 41

you are doing a T-test, I suppose.

The problem\( : \)
The distribution of cholesterol levels in teenage boys is approximately normal with μ = 170 and σ = 30. A random sample of 30 boys in your community has a sample mean cholesterol level = 190. Design and perform a hypothesis test to see if the boys in our community have an especially high cholesterol level.

Given\( : \)
Observed \(\color{#000000 }{ \displaystyle \overline{\rm X}_{(30)}=190}\)
Degrees of freedom \(\color{#000000 }{ \displaystyle df=30-1=29}\)
Hypothesis \(\color{#000000 }{ \displaystyle \mu_0=170}\)
\(\color{#000000 }{ \displaystyle \sigma=190}\)

just want to make sure you know what this all is referring to, to make sure we are on the same page...

Answer 42

Oh, excuse me,
\(\color{#000000 }{ \displaystyle \sigma=30}\)

Answer 43

is what I'm saying familiar or you haven't seen this before?

Answer 44

familiar to me just a little bit

Answer 45

just a little bit?

Answer 46

yeah

Answer 47

(I don't want to type a whole lot of abstruse business, right? So, if this isn't the way you typically do it in your class, then I would rather confuse you)

Answer 48

oh

Answer 49

Let's try this, tho', although I am bad at statistics.

Answer 50

okay

Answer 51

G2g see u saam I am

Answer 52

aight, see ya!

Answer 53

P-value approach:

The standard deviation of the sample of n=30, knowing that the popoluation standard deviation is 30, will be
\(\color{#000000 }{ \displaystyle \sigma_{(30)}=\frac{30}{\sqrt{30}} = \sigma_{(30)}=\sqrt{30} \approx 5.477 }\)

The t-test statistic is going to be
\(\color{#000000 }{ \displaystyle {\rm t-stat.}=\frac{\overline{\rm X}_{(30)}-\mu_0}{\sigma{(30)}} =\frac{190-170}{\sqrt{30}}=3.651}\)

let's suppose that our level of significance is
\(\color{#000000 }{ \displaystyle \alpha=0.05}\)
************************************************
You need to calculate the p-value (call it \(p\))
If \(p\le \alpha\), then there isn't enough evidence reject \(\rm H_0\).
If \(p>\alpha\), then we [do] reject the \(\rm H_0\).

Answer 54

There are some tables for p-values, or some calculator functions to calculate the p-value...

Answer 55

wow. thanks!!