The writer is very fast, professional and responded to the review request fast also. Thank you.
Respond to the discussion post below with YOUR educated opinion in 3-4 sentences WITH scholarly source backing it up
Z and T confidence intervals are different based on the sample size and whether or not the standard deviation is known. Generally, if a sample size (n) is greater than 30 and the standard deviation is known, than a z confidence interval or z score is used. On the other hand, if n<30 and the standard deviation is not known, then a t confidence interval or t test is used. These differences in t and z are results of the fluctuation in the t test sample variances.
A z test, or z confidence interval could be used at a donut shop that produces donuts in house. The owner of the shop could use a z score to determine the probability that a donut will fall between the acceptable size limits, or standard deviations, of donut sizes. If they sample donuts (50 out of a daily batch of 500) and have a determined standard deviation, they can with confidence predict the probability that a donut will fall in or out of the acceptable size limits.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.Read more
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.Read more
Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.Read more
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.Read more
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.Read more