I can’t figure out how to solve for the confidence level, I’m not sure if I’m plugging in the wrong numbers or missing a step B ReadiInorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain (fruit < vegetables < cereals < nuts < corpse). Geochemicalsurveys 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. TheHill of Tara is a very important archaeological site in Ireland. It is by legend the seat of Ireland's ancient high kingst. Independent random samples from two regions in Tara gave the following phosphorousmeasurements (ppm). Assume the population distributions of phosphorous are mound-shaped and symmetric for these two regions.Region I: x1 n1 = 12540 810 790 790 340 800890 860 820640 970720Region II: x2; n2 = 16750 870 700 810 965350 895 850635 955 710 890 520 650 280 993A USE SALT(a) Use a calculator with mean and standard deviation keys to calculate x1, S1, X2, and s2. (Round your answers to four decimal places.)X1=747 5S1 170 4073 ppmV ppmX2= 738 937552 = 212.1463V ppm(b) Let u be the population mean for x1 and let u, be the population mean for x2. Find an 85% confidence interval for u - 1z. (Round your answers to one decimal place.)lower limitX ppmupper limitX ppm(c) 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 85% level of confidence, isone region more interesting than the other from a geochemical perspective?O Because the interval contains both positive and negative numbers, we can not say that one region is more interesting than the other.O Because the interval contains only positive numbers, we can say that region I is more interesting than region II.O Because the interval contains only negative numbers, we can say that region II is more interesting than region I.O We can not make any conclusions using this confidence interval.P Type here to search10:22 PM44°F依 dx11/3/2021hpA>"brt scdeletehomeendPg up6)$496&*7\8backspcenumlockhome

We want to find the 85% confidence interval

(b) Let u, be the population mean for x, and let u, be the population Tmean for x2. Find an 85% confidence interval for u - Hz. (Round your answers to one decimal place.) lower limit X ppm upper limit X ppm (c) 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 85% level of confidence, is one region more interesting than the other from a geochemical perspective? O Because the Interval contains both positive and negative numbers, we can not say that one region is more interesting than the other. O Because the interval contains only positive numbers, we can say that region I is more interesting than region II. O Because the interval contains only negative numbers, we can say that region II is more interesting than region I. O We can not make any conclusions using this confidence interval. P Type here to search 10:22 PM 44°F 11/3/2021

(b) Let u, be the population mean for x, and let u, be the population Tmean for x2. Find an 85% confidence interval for u - Hz. (Round your answers to one decimal place.) lower limit X ppm upper limit X ppm (c) 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 85% level of confidence, is one region more interesting than the other from a geochemical perspective? O Because the Interval contains both positive and negative numbers, we can not say that one region is more interesting than the other. O Because the interval contains only positive numbers, we can say that region I is more interesting than region II. O Because the interval contains only negative numbers, we can say that region II is more interesting than region I. O We can not make any conclusions using this confidence interval. P Type here to search 10:22 PM 44°F 11/3/2021

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Why is the scientific method a useful tool for making predictions? Answer it to 3 sentences.
Hello, I'm not sure how to solve for the p-value in this question
I am only given one attempt at this. I need help. A newspaper report conducted a survey of 753 people in New York City and found that 27% of the population believe that the Yankees will miss the playoffs this year. In the accompanying dialogue, the report states, we are 99% confident that the true proportion of people in New York City who believe that the Yankees will miss the playoffs this year lies between 23% and 31% . What does 4% represent in the report? A. a parameterB. a statisticC. a confidence intervalD. a margin of errorE. a confidence level
A national study found that treating people appropriately for high blood pressure reduced their overall mortality by 20%. Treating people adequately for hypertension has been diffcult because it is estimated that 50% of hypertensives do not know they have high blood pressure, 50% of those who do know are inadequately treated by their physicians, and 50% who are appropriately treated fail to follow this treatment by taking the right number of pills. Answer the following questions ( please answer all the parts 1,2 and 3): 1) What is the probability that among 10 true hypertensives at least 50% are being treated appropriately and are complying with this treatment?2) What is the probability that at least 7 of the 10 hypertensives know they have high blood pressure? 3) If the preceding 50% rates were each reduced to 40% by a massive education program, then what effect would this change have on the overall mortality rate among true hypertensives; that is, would the mortality rate decrease…
Three friends are having a debate. They recently read that on average Americans drive 16 miles each way when computing to work by car (ABC News, 2007). Friend A suspects that the mean for Colorado residents is likely lower than the national average because the population density of Colorado increases the likelihood that people live closer to their jobs, while friend B suspects the mean for Colorado residents is likely higher than the national average. Friend C does not find either argument very convincing and instead suspects that the mean for Colorado residents is no different from the US population mean. The three friends bet a dinner at Alinea and set out to resolve the debate. Using a random sample of 20 Colorado residents, they calculate the mean for their sample to be 14.23 miles with a standard deviation of 2.34. The three friends did not pay very close attention in their statistics class, so they need your help making sense of these numbers. Compute the 95% confidence…
Many graduate school programs in the United States require applicants to take the Graduate Record Exam, also called the GRE. One part of the exam, the GRE-Quantitative test, assesses students' level of quantitative reasoning and thinking - exactly the skills we are building in our class this semester. The highest score possible on the GRE-Quantitative test is a score of 800. Many graduate schools think that a score of 700 or higher on the GRE-Quantitative test shows that the applicant has strong quantitative skills. The table shows the number of people who took the GRE between 2003 and 2006 who had GRE-Quantitative test Scores of 700 or higher. All of the people represented in the table planned to major in one of the two listed areas of the social sciences. a. Complete the table. INTENDED MAJOR GRE-QUANTITATIVE SCORE Below 700 700 to 800 TOTAL Economics 2,143 6,775 Political Science 4,071 19,450 TOTAL 8,703
Many graduate school programs in the United States require applicants to take the Graduate Record Exam, also called the GRE. One part of the exam, the GRE-Quantitative test, assesses students' level of quantitative reasoning and thinking - exactly the skills we are building in our class this semester. The highest score possible on the GRE-Quantitative test is a score of 800. Many graduate schools think that a score of 700 or higher on the GRE-Quantitative test shows that the applicant has strong quantitative skills. The table shows the number of people who took the GRE between 2003 and 2006 who had GRE-Quantitative test scores of 700 or higher. All of the people represented in the table planned to major in one of the two listed areas of the social sciences. a. Complete the table. 1 N D AS GRE-QUANTITATIVE SCORE
A researcher designs an intervention to combat anti-Arab oppression. She also designs a questionnaire to measure anti-Arab oppression so she can test the participants' level of anti-Arab oppression before and after the intervention. She tests one version of her questionnaire with 45 statements and a shorter version with 12 statements. In both questionnaires, the participants respond to each statement with a rating on a 5-point Likert scale with 0 equaling "strongly disagree" and 4 equaling "strongly agree." The overall score for each participant is the mean of his or her ratings for the different statements on the questionnaire. Look at the following graphs. Graph I graphs the results from the long version, and Graph II graphs the results from the short version. Graph I Graph II PARTICIPANTS PARTICIPANTS 8 8 7 7 6 6 4 4 3 3 2 1 1 1 2 3 4 2 4 LONG QUESTIONNAIRE SCORE SHORT QUESTIONNAIRE SCORE Complete the following sentences by trusting your eyes to see meaningful differences in the two…
The past records of a supermarket show that its customers spend an average of $110 per visit at this store. Recently the management of the store initiated a promotional campaign according to which each customer receives points based on the total money spent at the store, and these points can be used to buy products at the store. The management expects that as a result of this campaign, the customers should be encouraged to spend more money at the store. To check whether this is true, the manager of the store took a sample of 14 customers who visited the store. The following data give the money (in dollars) spent by these customers at this supermarket during their visits. 106.13 107.43 124.68 124.88 101.17 72.75 85.45 86.05 100.4 98.84 101.63 95.56 89.40 119.52 Assume that the money spent by all customers at this supermarket has a normal distribution. Using a 2.5% significance level, can you conclude that the mean amount of money spent by all customers at this supermarket after the…