Question

**POST #4**

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**Question 4**

What are some of the assumption to use to determine a confidence interval for the population mean with an unknown standard deviation? Provide examples.

**Question 5**

Define the confidence interval for a population proportion and indicate how it is estimated with an example.

**Question 6**

What are the factors that determine the sample size? How is sample size calculated for estimating the population mean? Provide examples.

Answer #1

Question4:

When population standard deviation is unknown then we need to use t-confidence interval.

Assumptions are:

Eiether populaiton should be normally distributed or sample size should be atleast 30 to apply CLT.

The sample should be simple random sample from population.

Obervations should be independent.

For eaxmple:

Suppose we have

And let it is given that populaiton is normally distributed.

Since there 16 data values in the sample so degree of freedom is df=16-1=15 and critical value of t for 95% confidence interval, using excel function "=TINV(0.05,15)" is 2.131.

The required confidence interval is

Therefore, a 95% confidence interval for the mean is (24.19, 27.81).

POST #2
I POST THESE QUESTIONS TWICE PLEASE DO NOT DUPLICATE
YOUR ANSWERS TO BOTH POSTS
PLEASE DO NOT UPLOAD PHOTOS FOR ANSWERS, IT
REALLY DOES NOT WORK FOR ME, THANKS FOR
UNDERSTANDING
PROVIDING EXAMPLES FOR QUESTIONS IS SO IMPORTANT, PLEASE
PROVED EXAMPLE FOR QUESTIONS, THANKS
Question 1
What is the point estimate for a population mean? Provide
examples.
Question 2
What are the confidence intervals for a population mean? Provide
examples.
Question 3
A confidence interval for the population...

POST #3
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3. PLEASE PROVIDE EXAMPLE FOR QUESTIONS,
THANKS
Question 6
What is the standard error of the mean? Provide examples.

Post #1
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DISCUSSION:
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relevant to anthropology and that is just about anything. You can
post links or discuss other concepts that interested you in the
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FOR...

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We are interested in estimating the mean systolic blood pressure
for female diabetics between the ages of 30 and 34. For the
purposes of this question you may assume that blood pressure in
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a. A random sample of 10 women is selected from this population.
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Can i please get detailed answer for this question from my
assignment. it has overall weightage of 9 marks. Thanks
We are interested in estimating the mean systolic blood pressure
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this population has a normal distribution with standard deviation
of 11.8 mmHg.
a. A random sample of 10 women is selected from this population.
The average systolic...

Please answer both of the following
What is the sample size needed to provide a margin of error of 3
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10?
A local university administers a comprehensive examination to
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Grade
78
70
76
81
95
At 99% confidence, determine an interval for the mean of...

Looking at my answers, I was am always off buy about range of .1
to .4 from the correct answer that is stated. I am having a really
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like what is shown as correct so I need a little help with figuring
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Use Excel please.( norm.inv, t.inv, )
QUESTION 2
(a) Suppose that your task is to estimate the mean of a normally
distributed population to within 8 units with 95% confidence and
that the population standard deviation is known to be 72. What
sample size should be used if you wish to estimate the population
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(b) Determine the minimum sample size required for estimating the
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answer all these questions please with the right question number
next to its letter
QUESTION 27
If a you want to investigate the tread life of your company’s
tires, and you took a sample of 10 tires and constructed a 95%
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A
11 degrees of freedom and t value of 2.201
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