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!!!!!

Statistics 
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 
Statistics 
Anon,
Some answers are wrong.

Statistics 
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.

Statistics 
Charlotte,
What are the wrong answer?

Statistics 
Din123,
The questions 2, 3 and 4 are wrong

Statistics 
OK,
Need answer to P 10

Statistics 
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!

Statistics 
stat001,
The Pvalue of the test is closest to
ans is 1.5% 
Statistics 
stat001,
question number 10 ans is
"onesample z = (2.95  2.9)/0.055 = 0.909; P large; conclude chance variation" 
Statistics 
stat001,
PROBLEM 7 ans is 14.5

Statistics 
stat001,
PROBLEM 9 ans is 3

Statistics 
stat001,
PROBLEM 8 ans is 1.8

Statistics 
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 
Statistics 
stat001,
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 
Statistics 
Helen,
P3 is 11

Statistics 
stat001,
@helen thank you..
@stat002 answer already posted as
"The Pvalue of the test is closest to
ans is 1.5% " 
Statistics 
stat001,
PROBLEM 4's ans is 2.5

Statistics 
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 
Statistics 
Helen,
Thank you stat001
The link you gave us is not directing on a specific question. 
Statistics 
Din123,
PROBLEM 1  "E" and "F"

Statistics 
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  "onesample z = (2.95  2.9)/0.055 = 0.909; P large; conclude chance variation" 
Statistics 
stat001,
@Din123 Thank you

Statistics 
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.

Statistics 
Anonymous,
Honor Code
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Statistics 
Thanks,
Stat001 @Din123, well done