# Statistics

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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!!!!!

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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

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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.

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The questions 2, 3 and 4 are wrong

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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!

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The P-value of the test is closest to

ans is 1.5%

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question number 10 ans is

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

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PROBLEM 7 ans is 14.5

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PROBLEM 9 ans is 3

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PROBLEM 8 ans is 1.8

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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

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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

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P3 is 11

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@helen- thank you..

"The P-value of the test is closest to

ans is 1.5% "

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PROBLEM 4's ans is -2.5

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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

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Thank you stat001

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

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PROBLEM 1 - "E" and "F"

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@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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@Din123 Thank you

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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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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.

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Stat001 @Din123, well done