Asked by Audrey

The distribution of cholesterol levels of the residents of a state closely follows the normal curve. Investigators want to test whether the mean cholesterol level of the residents is 200 mg/dL or lower. A simple random sample of 12 residents has a mean cholesterol level of 185 mg/dL, with an SD of 20 mg/dL (computed as the ordinary SD of a list of 12 numbers, with 12 in the denominator).

Let m be the mean cholesterol level of the residents of the state, measured in mg/dL. Perform a t test of the hypotheses

Null: m = 200 Alternative: m < 200


QUESTION 1.

You are using data from a simple random sample to test the given hypotheses. Which of the following collections of observations is further required to justify the use of a t distribution to compute the P-value?

The distribution of the cholesterol levels of the residents of the state is close to normal.

The distribution of the cholesterol levels of the residents of the state is close to normal, with an unknown mean.

The distribution of the cholesterol levels of the residents of the state is close to normal, with an unknown mean and an unknown SD.

QUESTION 2

The t distribution that should be used has ______ degrees of freedom.

QUESTION 3

The value of the t statistic is closest to

-2 -2.1 -2.2 -2.3 -2.4 -2.5 -2.6 -2.7 -2.8 -2.9 -3

QUESTION 4

The P-value of the test is closest to

0.5% 1% 1.5% 2% 2.5% 3%

QUESTION 5

The conclusion of the test is to

reject the null hypothesis
not reject the null hypothesis

Thank you!!!!!
Answered by Peter
QUESTION 1.
The distribution of the cholesterol levels of the residents of the state is close to normal, with an unknown mean and an unknown SD.

QUESTION 4
2%

QUESTION 5
reject the null hypothesis

QUESTION 2
2

QUESTION 3
-2.3

Answered by Anon
Some answers are wrong.
Answered by CC
this test is easy listen the videos and do the exercises of those videos and it's easy. If you have any doubt just ask.
Answered by Charlotte
What are the wrong answer?
Answered by Din123
The questions 2, 3 and 4 are wrong
Answered by OK
Need answer to P 10
Answered by Marcov
Do not try the answers they tell you. We have many stupids here with psycho problems. They tell you randomly the answers to try for them!
Answered by stat001
The P-value of the test is closest to

ans is 1.5%
Answered by stat001
question number 10 ans is

"one-sample z = (2.95 - 2.9)/0.055 = 0.909; P large; conclude chance variation"
Answered by stat001
PROBLEM 7 ans is 14.5
Answered by stat001
PROBLEM 9 ans is 3
Answered by stat001
PROBLEM 8 ans is 1.8
Answered by stat002
Does anybody know the P4 and P5 answers?

P4: -2.6 -2.1 and -2.3 are wrong
P5: 1%, 2.5%, and 0.5% are wrong
Answered by stat001
can anyone let me know the answer to

PROBLEM 1 -
A statistical test is performed, and its P-value turns out to be about 3%. Which of the following must be true? Pick all that are correct.

PROBLEM 3 -
The t distribution that should be used has ______ degrees of freedom.

PROBLEM 4 -

The value of the t statistic is closest to

Note- me and my friends found the below ones are to be wrong ans to PROBLEM 4

-2.6
-2.8
-2.3
-2.9
-2.1
-2.7

so ans could be one among these

-2
-2.2
-2.4
-2.5
-3

Answered by Helen
P3 is 11
Answered by stat001
@helen- thank you..

@stat002- answer already posted as

"The P-value of the test is closest to

ans is 1.5% "
Answered by stat001
PROBLEM 4's ans is -2.5
Answered by stat001
have started another question forum with answers to make life easier......

jiskha com/display.cgi?id=1375826423

put a . b/w 1st two words.. site is not allowing me to post weblinks
Answered by Helen
Thank you stat001

The link you gave us is not directing on a specific question.
Answered by Din123
PROBLEM 1 - "E" and "F"
Answered by stat001
@Helen - i can see that,not sure how the page was deleted,see below incl ur ans

PROBLEM 1

ans: E & F

PROBLEM 2

ans: C - "The distribution of the cholesterol levels of the residents of the state is close to normal, with an unknown mean and an unknown SD"

PROBLEM 3

ans:11

PROBLEM 4

ans:-2.5

PROBLEM 5

ans:1.5%

PROBLEM 6

ans:reject the null hypothesis

PROBLEM 7

ans:14.5

PROBLEM 8

ans:1.8

PROBLEM 9

ans:3

PROBLEM 10

ans: B - "one-sample z = (2.95 - 2.9)/0.055 = 0.909; P large; conclude chance variation"
Answered by stat001
@Din123 Thank you
Answered by Anonymous
Why bother doing this class if you're just asking people to give you the answers? It's a free online class with no grades.
Answered by Anonymous
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Answered by Thanks
Stat001 @Din123, well done
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