Find the mean and standard deviation of the sampling distribution, Statistics Assignment Homework Help

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timer Asked: May 26th, 2016
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1.  A farmer divided a field into 1-foot by 1-foot sections and tested soil samples from 32 randomly selected sections in the field. He finds that the mean pH level of the samples is 5.7 with a standard deviation of 0.26.


(a)  Find the mean and standard deviation of the sampling distribution of all possible soil samples of size . Round to three decimal places.

(b)  Construct a 95% confidence interval for the mean pH level of soil samples from every 1-foot by 1-foot section. Show your work. Even if you use technology, show the expression that is used to determine the margin of error for the interval. Interpret the interval in a complete sentence.

(c)  The farmer tested soil samples from 34 randomly selected sections from another field. He found the mean pH level of those samples to be 6.1 with a standard deviation of 0.34. Construct a 95% confidence interval for the difference between the mean pH levels of all possible soil samples from both fields. Show your work. Even if you use technology, show the expression that is used to determine the margin of error for the interval. Interpret the interval in a complete sentence.

Answer: ?


Tutor Answer

Soarance
School: UT Austin

a) The mean is 5.7. The standard deviation of the sample is 2.6. The standard deviation of all field populations, however, is 2.6 divided by the square root of the number of samples. So for this case, the stardard deviation of all fields (also known as the standard error) is:= 2.6 / sqrt(32)= 2.6 / 5.657= 0.460b) Here is the equation for the confidence interval:= x +/- t * SE...where ...

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Anonymous
Tutor went the extra mile to help me with this essay. Citations were a bit shaky but I appreciated how well he handled APA styles and how ok he was to change them even though I didnt specify. Got a B+ which is believable and acceptable.

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