# Answer in Statistics and Probability for blossomqt #248889

One company produces premium grade carbon steel for Katana Sword manufacturers. Two different analytical methods were used to detect the contamination level of the carbon steel in 8 random specimens

SPECIMEN

Subjects 12345678

Method 1 1.2 1.3 1.5 1.4 1.7 1.8 1.4 1.3 Method 2 1.4 1.7 1.5 1.3 2.0 2.1 1.7 1.6

Is there sufficient evidence to conclude that tests differ in the mean contamination level use? = 0.01?

There are two samples in which observations in sample1(contamination level by method 1) can be paired with observations in sample 2(contamination level by method 2)

The hypotheses tested are,

“H_0:mu_d=0”

“Against”

“H_1:mu_dnot=0”, where “d” is the difference between each pair of observations in method 1 and method 2.

To test these hypotheses, we first determine the mean of the differences“(bar{d})” given by,

“bar{d}=sum (d)/n” ,where “n=8” and use the students’ t distribution to make a decision.

Now,

“sum(d)=-1.7”

Therefore,

“bar{d}=-1.7/8=-0.2125”

Variance of the differences is given by,

“V(d)=sum(d-bar{d})^2/(n-1)”

“V(d)=0.20875/7=0.02982143”

The standard deviation “SD(d)” is given by,

“SD(d)=sqrt{V(d)}=sqrt{0.02982143}=0.1727(4space decimalspace places)”

The t-test statistic is given by,

“t=bar{d}/(SD(d)/sqrt{n})”

“t=-0.2125/(0.1727/sqrt{8})”

“t=-0.2125/0.061055=-3.4805(4space decimalspace places)”

The t-test statistic is compared with the t-table value with “alpha=0.01” and “(n-1)=8-1=7” degrees of freedom.

Table value is,

“t_{alpha/2,7}=t_{0.01/2,7}=t_{0.005,7}=3.499”

To make comparison, we use the absolute value of the t-test statistic, that is,

“|t|=|-3.4805|=3.4805” and reject the null hypothesis if “|t|gt t_{0.005,7}.”

Since “|t|=3.4805lt t_{0.005,7}=3.499,” we fail to reject the null hypothesis and conclude that, there is no sufficient evidence to show that the tests differ in the mean contamination level at “1%” level of significance.

Calculate the price
Pages (550 words)
\$0.00
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with TheBestPaperWriters
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
Testimonials
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
English 101
Very good job. I actually got an A
Customer 452443, September 25th, 2022
Psychology
Thanks a lot the paper was excellent
Customer 452453, October 26th, 2022
Excellent service - thank you!
Customer 452469, February 20th, 2023
Anthropology
Excellent services will definitely come back
Customer 452441, September 23rd, 2022
Excellent timely work
Customer 452451, April 19th, 2023
Nursing
The paper was EXCELLENT. Thank you
Customer 452449, September 23rd, 2022
Theology
Job well done and completed in a timely fashioned!
Customer 452451, November 18th, 2022
Job well done. Finish paper faster than expected. Thank you!
Customer 452451, October 3rd, 2022
Architecture, Building and Planning
The assignment was well written and the paper was delivered on time. I really enjoyed your services.
Customer 452441, September 23rd, 2022
Anthropology
excellent loved the services
Customer 452443, September 23rd, 2022
Thank you!
Customer 452451, November 27th, 2022
11,595
Customer reviews in total
96%
Current satisfaction rate
3 pages
Average paper length
37%
Customers referred by a friend