Posted by Audrey on Sunday, August 4, 2013 at 11:23am.
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, Sunday, August 4, 2013 at 2:17pm
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, Monday, August 5, 2013 at 9:02am
Some answers are wrong.

Statistics  CC, Monday, August 5, 2013 at 12:45pm
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, Monday, August 5, 2013 at 1:38pm
What are the wrong answer?

Statistics  Din123, Tuesday, August 6, 2013 at 8:16am
The questions 2, 3 and 4 are wrong

Statistics  OK, Tuesday, August 6, 2013 at 10:34am
Need answer to P 10

Statistics  Marcov, Tuesday, August 6, 2013 at 1:17pm
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, Tuesday, August 6, 2013 at 3:12pm
The Pvalue of the test is closest to
ans is 1.5%

Statistics  stat001, Tuesday, August 6, 2013 at 3:14pm
question number 10 ans is
"onesample z = (2.95  2.9)/0.055 = 0.909; P large; conclude chance variation"

Statistics  stat001, Tuesday, August 6, 2013 at 3:20pm
PROBLEM 7 ans is 14.5

Statistics  stat001, Tuesday, August 6, 2013 at 3:20pm
PROBLEM 9 ans is 3

Statistics  stat001, Tuesday, August 6, 2013 at 3:23pm
PROBLEM 8 ans is 1.8

Statistics  stat002, Tuesday, August 6, 2013 at 3:39pm
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, Tuesday, August 6, 2013 at 3:41pm
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, Tuesday, August 6, 2013 at 5:06pm
P3 is 11

Statistics  stat001, Tuesday, August 6, 2013 at 5:43pm
@helen thank you..
@stat002 answer already posted as
"The Pvalue of the test is closest to
ans is 1.5% "

Statistics  stat001, Tuesday, August 6, 2013 at 5:54pm
PROBLEM 4's ans is 2.5

Statistics  stat001, Tuesday, August 6, 2013 at 6:06pm
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, Wednesday, August 7, 2013 at 5:38am
Thank you stat001
The link you gave us is not directing on a specific question.

Statistics  Din123, Wednesday, August 7, 2013 at 8:54am
PROBLEM 1  "E" and "F"

Statistics  stat001, Wednesday, August 7, 2013 at 2:10pm
@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, Wednesday, August 7, 2013 at 2:11pm
@Din123 Thank you

Statistics  Anonymous, Wednesday, August 7, 2013 at 7:14pm
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, Wednesday, August 7, 2013 at 10:06pm
Honor Code
This can be found at edx org/honor and you are required to follow it. The course staff would like to express their appreciation of all the students who follow the honor code scrupulously.
The honor code is not just decoration or boilerplate; it sets out community standards that make the course grades and certificate meaningful, and indeed make the entire endeavor of the course worthwhile. Publishing course materials without proper attribution is theft of intellectual property; asking others to do your work for you is cheating. Please do not diminish the honest efforts of your fellow students by violating the honor code. Donâ€™t steal or cheat.

Statistics  Thanks, Thursday, August 8, 2013 at 11:40pm
Stat001 @Din123, well done
Answer This Question
Related Questions
 elementary statistics  The distribution of cholesterol levels in teenage boys ...
 statistics  The following table shows the summary statistic of the cholesterol ...
 statistics  The cholesterol levels of young women aged 20 to 34 vary ...
 Math  A researcher wants to estimate the mean blood cholesterol level of young ...
 Statistics  The mean serum cholesterol level in the population of males who do ...
 MathStatistics  I have a couple of questions that need reviewI've answered ...
 Math  1.)Suppose you interview 10 randomly selected workers and ask how many ...
 statistics  mean cholesterol is 175mg/dl..standard deviation =20mg/dl assume ...
 biostatistics  A studyis run to estimate the mean total cholesterol level in ...
 Statistics  Cholesterol levels of adult males are approximately normally ...
More Related Questions