Statistics


Statistics

Statistics


1 Statistics:

Category:
Words:
Amount: $20
Writer: 0

Paper instructions

Statistics: (Please show stepts) Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain (fruit < vegetables < cereals < nuts < corpse). Geochemical surveys take soil samples to determine phosphorous content (in ppm, parts per million). A high phosphorous content may or may not indicate an ancient burial site, food storage site, or even a garbage dump. The Hill of Tara is a very important archaeological site in Ireland. It is by legend the seat of Ireland's ancient high kings†. Independent random samples from two regions in Tara gave the following phosphorous measurements (ppm). Assume the population distributions of phosphorous are mound-shaped and symmetric for these two regions. Region I: x1; n1 = 12540810790790340800890860820640970720 Region II: x2; n2 = 16750870700810965350895850635955710890520650280993 x1= ppm s1= ppm x2= ppm s2= ppm Let ?1 be the population mean for x1 and let ?2 be the population mean for x2. Find a 99% confidence interval for ?1 ? ?2. (Round your answers to one decimal place.) lower limit ppm upper limit ppm Explain what the confidence interval means in the context of this problem. Does the interval consist of numbers that are all positive? all negative? of different signs? At the 99% level of confidence, is one region more interesting than the other from a geochemical perspective? We can not make any conclusions using this confidence interval. Because the interval contains only negative numbers, we can say that region II is more interesting than region I. Because the interval contains only positive numbers, we can say that region I is more interesting than region II. Because the interval contains both positive and negative numbers, we can not say that one region is more interesting than the other. Which distribution (standard normal or Student's t) did you use? Why?Student's t was used because ?1 and ?2 are known. Standard normal was used because ?1 and ?2 are known. Student's t was used because ?1 and ?2 are unknown. Standard normal was used because ?1 and ?2 are unknown.

Answer

Get Essay Answer
1,200,000+ Questions
Satisfaction guaranteed
Paul's Food Truck, New Equipment Paul is looking to modernize his food truck. In the latest edition of "Food Truck Monthly" the latest and...
The first is to demonstrate that you can find economic data for the US economy. The second is to demonstrate that you can graph the data in such a...
In random samples of 25 from each of two normal populations, we found the following statistics:
To determine whether a metal lathe that produces machine bearings is properly adjusted, a random sample of 25 bearings is collected and the diameter...