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Martin,
Physicist

Category: Homework

Satisfied Customers: 765

Experience: 20+ years of research, engineering and teaching

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For MartinObjective:There is thought among some people

Customer Question

For Martin

Objective: There is thought among some people at your facility that the old method and the new method are producing product at different thicknesses. You DO NOT WANT the methods to be different. In fact, you want the methods to be producing products that are the same. To address this, you suggest using a T test. If the methods are significantly different, you have a problem. If the null is NOT rejected--that is good news! The team agrees that a sample size of 25 is adequate for the test. Remember...You are hoping the null does not get rejected. The team decides a significance level at 0.05 for the test.

Instructions for you: Step 1. You need 4 numbers: Old method's average: m = .012576 New method's average: x-bar (you need to calculate it from the data below) Standard deviation of sample data 's' (you need to calculate it from the data below) n number of samples 'n' (you need to count them yourself from the data below) Step 2. State the null and alternate hypothesis. Step 3. Calculate the T test statistic from the formula found in the t test lecture in your white manuals. (Use ALL of the available digits, DO NOT ROUND!) Step 4. Determine the critical T value (refer to the T-distribution Table in the Online Textbook.) [Hint: (n - 1) is 25 - 1 = 24 df] and considering a 95% confidence. Step 5. What is your conclusion?

"How did you come up with µ?" "How can I find x-bar?" "How can I find S?" "Hypothesis statement?" "How much help is Excel for this?" "My conclusion?" "I'm lost in calculating the Test Statistic" "What's the difference between 1-tail or 2?"

Target Assignment Date - Submit in Week 7 or earlier

Project: Manufacturing Deliverable: T Test Student last name: Your last name here REPORT ALL OF THE RESULTS TO AT LEAST 4 DECIMAL PLACES! Old method average::: Enter here Check New method average::: Enter here Check Standard deviation (s)::: What is S? Check n = ::: What is n?

State the null hypothesis::: Write the null hypothesis here.

State the alt. hypothesis::: Write the alt. hypothesis here.

T test statistic::: What is it? Check One tail or two? 1 or 2? Critical value::: What is it? Check Reject the null? (yes, or no?)::: Y or N?

Please write the hypothesis conclusion::: Write your conclusion here.

Martin can you type out the null hypothesis and alt hypothesis separately so I can add them into my work. I have to put them in two separate blocks and I can't seem to type them in separately. Thanks new assignments coming your way.

I checked it over, and everything looks fine. The hypotheses are correct, as are the numbers. Do you have any more information about what your instructor is unhappy with?

Martin I hate to bother you but this is what my instructor sent. I only received partial credit to pass class I have to get full credit for assignment.

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REPORT ALL OF THE RESULTS TO AT LEAST 4 DECIMAL PLACES! Old method average::: 0.0126 New method average::: 0.0114 Standard deviation (s)::: " 0.0019 " n = ::: 25

State the null hypothesis::: H0 : x-bar =µ

State the alt. hypothesis::: H1 : x-bar not equal µ

T test statistic::: 3.1795 One tail or two? 2 Critical value::: 0.00403578 Reject the null? (yes, or no?)::: Y

Please write the hypothesis conclusion::: Since this is less than our required of 0.05, we Reject the null Hypothesis with 95% confidence and conclude that the mean thickness of the new method is not the same as the old

Martin can you please add the data to this file for me. Maybe I am sending it wrong to my instructor. Man I will Be happy when I am out of this class LOL.

From my instructor. I attched the Hypothesis testing example from my review school work.

Please reconsider your hypothesis statements (not sure why you keep submitting the same responses that were previously noted as incorrect?)

What are the criteria for the hypothesis statements that we discussed during the virtual class session? Did you have a chance to carefully review the format of the examples provided during the session (note they all meet the criteria!)

As far as I can tell, it's a matter of semantics. It's very clear from the problem what the null and alternative hypotheses must be. The null hypothesis is that the new mean is the same as the old, and the alternative is that the two are different. It's really that simple. Maybe because we used H0 and H1 instead of H0 and HA? Or maybe he/she doesn't like the variable names? In any event, in an effort to be as much like the lecture slides you sent, you might try this version, but other than that I'm afraid I'm out of ideas.

Ok I have one more I will post for you in maybe 30 minutes. Another expert did the work but I need one part relooked and he/she never responded so I will post it for you and once you reply I will add the excel. I am coming to the end of my class and my project has to be complete before Sunday. You have been a great Help Martin!!!!

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