Monday

April 27, 2015

April 27, 2015

Posted by **Audrey** on Sunday, August 4, 2013 at 11:23am.

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!!!!!

- Statistics -
**Peter**, Sunday, August 4, 2013 at 2:17pmQUESTION 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

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**Anon**, Monday, August 5, 2013 at 9:02amSome answers are wrong.

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**CC**, Monday, August 5, 2013 at 12:45pmthis test is easy listen the videos and do the exercises of those videos and it's easy. If you have any doubt just ask.

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**Charlotte**, Monday, August 5, 2013 at 1:38pmWhat are the wrong answer?

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**Din123**, Tuesday, August 6, 2013 at 8:16amThe questions 2, 3 and 4 are wrong

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**OK**, Tuesday, August 6, 2013 at 10:34amNeed answer to P 10

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**Marcov**, Tuesday, August 6, 2013 at 1:17pmDo 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!

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**stat001**, Tuesday, August 6, 2013 at 3:12pmThe P-value of the test is closest to

ans is 1.5%

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**stat001**, Tuesday, August 6, 2013 at 3:14pmquestion number 10 ans is

"one-sample z = (2.95 - 2.9)/0.055 = 0.909; P large; conclude chance variation"

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**stat001**, Tuesday, August 6, 2013 at 3:20pmPROBLEM 7 ans is 14.5

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**stat001**, Tuesday, August 6, 2013 at 3:20pmPROBLEM 9 ans is 3

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**stat001**, Tuesday, August 6, 2013 at 3:23pmPROBLEM 8 ans is 1.8

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**stat002**, Tuesday, August 6, 2013 at 3:39pmDoes 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 3:41pmcan 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

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**Helen**, Tuesday, August 6, 2013 at 5:06pmP3 is 11

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**stat001**, Tuesday, August 6, 2013 at 5:43pm@helen- thank you..

@stat002- answer already posted as

"The P-value of the test is closest to

ans is 1.5% "

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**stat001**, Tuesday, August 6, 2013 at 5:54pmPROBLEM 4's ans is -2.5

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**stat001**, Tuesday, August 6, 2013 at 6:06pmhave 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 5:38amThank you stat001

The link you gave us is not directing on a specific question.

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**Din123**, Wednesday, August 7, 2013 at 8:54amPROBLEM 1 - "E" and "F"

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**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 - "one-sample z = (2.95 - 2.9)/0.055 = 0.909; P large; conclude chance variation"

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

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**Anonymous**, Wednesday, August 7, 2013 at 7:14pmWhy 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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**Anonymous**, Wednesday, August 7, 2013 at 10:06pmHonor 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. Don’t steal or cheat.

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**Thanks**, Thursday, August 8, 2013 at 11:40pmStat001 @Din123, well done