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I'm having probelms trying to solve this problem. Please, if anyone can help me it would be great. Thank you in advance, any help would be great, thanks!

Here's the problem:

The situation is as follows:
"A machine that produces metal rods used in an automobile suspension system is tested to ensure that the average diameter of the rods it produces do not exceed 8.20mm. A random sample of 15 rods is selected, and the diameter (in mm) is measured for each stem. The data obtained are presented below. "

8.24 8.23 8.20 8.21 8.20 8.28 8.23 8.26 8.24 8.25 8.19 8.25 8.26 8.23 8.24

You can use any statistical software to answer the following questions:


State:

Does the data provide sufficient evidence that the average stem diameter exceeds 8.20 mm using a significance level of 0.05? Please use the four-step process.

Map:

* Indicate name of the appropriate test procedure (eg pairs t test) (1 pt)
* Describe the parameter measured and the population of interest in the context of the problem (2 pts)
* State null and alternative hypotheses (2 pts)
* State level of importance (1 pt)


Solve:

* Plot data and describe the shape of your yard (You really need to plot your data by hand on your paper.) (1 pt)
* List and verify the conditions of inference (2 pts)
* Give the value (s) Statistics Sample (s) (1 pt)
* State the value of a statistical test (Please show your calculations.) As the P-value. (2 pts)


Conclude:

Answer the question posed by the problem or the study in context. Be sure to include the three parts of a conclusion (3 pts):

* Compare with P-value α
* Indicate if you "reject" or "does not reject H0"
* State concluded in its context.

State:

Calculate a confidence interval 95% to estimate the true mean diameter of these metal rods.

Map:

* Indicate name of the appropriate estimation procedure (eg pairs t test) (1 pt)
* Describe the parameters that we estimated (1 pt)
* Level of confidence of the State (1 pt)


Solve:

* You have already traced the data and verify the conditions in Part 1, so that you do not do it again here.
* Reaffirmation of the value (s) of the statistical sample (s) (1 pt)
* Calculate the confidence interval (1pt)


Conclude:

Interpret your confidence interval in context (3 pts)

Thank you

Whoa! Buddy! This is not the kind of question you ask on Yahoo! Answers. I am taking statistics right now and I'm in Grade 11. We find the nullity and the alternative hypothesis, but that's all. We do not as much as you are with him. I thought, "Hey, let me answer his question, but when I saw your Q, I was like, NVM! You probably do not care, but I felt like telling you anyway. :)