Statistics
posted by Audrey on .
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 Pvalue?
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 Pvalue 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!!!!!

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 
Some answers are wrong.

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.

What are the wrong answer?

The questions 2, 3 and 4 are wrong

Need answer to P 10

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!

The Pvalue of the test is closest to
ans is 1.5% 
question number 10 ans is
"onesample z = (2.95  2.9)/0.055 = 0.909; P large; conclude chance variation" 
PROBLEM 7 ans is 14.5

PROBLEM 9 ans is 3

PROBLEM 8 ans is 1.8

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 
can anyone let me know the answer to
PROBLEM 1 
A statistical test is performed, and its Pvalue 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 
P3 is 11

@helen thank you..
@stat002 answer already posted as
"The Pvalue of the test is closest to
ans is 1.5% " 
PROBLEM 4's ans is 2.5

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 
Thank you stat001
The link you gave us is not directing on a specific question. 
PROBLEM 1  "E" and "F"

@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  "onesample z = (2.95  2.9)/0.055 = 0.909; P large; conclude chance variation" 
@Din123 Thank you

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.

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Stat001 @Din123, well done