The homogeneity of the chloride level in a watersample from a lake was tested by analyzing por-tions drawn from the top and from near the bottomof the lake, with the following results in ppm CI:Top26.30Bottom26.2226.4326.3226.2826.2026.1926.1126.4926.42(a) Apply the i test at the 95% confidence level todetermine if the means are different.(b) Now use the paired / test and determine whetherthere is a significant difference between the topand bottom values at the 95% confidence level.(c) Why is a different conclusion drawn from usingthe paired i test than from just pooling the dataand using the normal i test for differences inmeans?

a) The null hypothesis is a simple statement about the value of the population parameter which is…

Answered: The homogeneity of the chloride level…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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During a routine check of the fluoride content of Gotham City's water supply, the given results were obtained from replicate analyses of a single sample: 0.513 mg/L0.513 mg/L , 0.487 mg/L0.487 mg/L , 0.511 mg/L0.511 mg/L , 0.489 mg/L0.489 mg/L , and 0.519 mg/L0.519 mg/L . Determine the mean and 90% confidence interval for the average fluoride concentration in this sample. Report the mean and the confidence interval with three significant figures.
(c) Rashid carried out pyrolysis of sawdust in a semi-batch reactor and obtained replicates of measurement under the same conditions in order to test the precision of the method. The recorded values for biochar are 22.23, 22.18, 22.25, 22.09, and 22.17 wt%. Using a suitable test, analyze whether the value of 22.09 wt% is a valid measurement at a 95% confidence level?
An article contained the following observations on degree of polymerization for paper specimens for which viscosity times concentration fell in a certain middle range: 415 420 422 423 425 429 432 435 437 438 446 447 449 451 456 463 464 (c) Calculate a two-sided 95% confidence interval for true average degree of polymerization. (Round your answers to two decimal places.) ,
The Wind Mountain archaeological site is located in southwestern New Mexico. Wind Mountain was home to an ancient culture of prehistoric Native Americans called Anasazi. A random sample of excavations at Wind Mountain gave the following depth (in cm) from present-day surface grade to the location of significant archaeological artifacts. 85 45 120 80 75 55 65 60 65 95 90 70 75 65 68 Compute a 95% confidence interval for the mean depth at mu which archaeological artifacts from the Wind Mountain excavation site can be found
A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.11, 3.24, 3.27. What is the 95% confidence interval for the mean of the data, assuming(a) No prior information about the precision of the analysis?(b) s → σ = 0.056 mmol Ca/L?
A survey of an urban university (population of 35,540) showed that 840 of 1,300 students sampled supported a fee increase to fund improvements to the student recreation center. Reference: Ref 2 Using the 95% level of confidence, what is the confidence interval for the proportion of students supporting the fee increase? Group of answer choices [0.767, 0.815] [0.612, 0.580] [0.771, 0.811] [0.620, 0.672]
An article contained the following observations on degree of polymerization for paper specimens for which viscosity times concentration fell in a certain middle range: 415 421 422 423 425 427 430 435 437 439 446 446 448 453 456 463 464 Calculate a two-sided 95% confidence interval for true average degree of polymerization.
The Rowntown Cab Company has 26 cabs. The local man-ager wants to conduct a work sampling study to determine what proportion of the time a cab driver is sitting idle,which he estimates is about 30%. The cabs were observedat random during a five-day period by the dispatcher, who simply called each cab and checked on its status. The man-ager wants the estimate to be within 3% of the propor-tion, with a 95% level of confidence. a. Determine the sample size for this work sampling study.b. The results of the first 20 observations of the worksampling study are shown as follows.What is the revised estimate of the sample size based onthese initial results? Observation Idle Cabs Observation Idle Cabs1 4 11 62 3 12 43 5 13 34 8 14 55 7 15 2
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On the Navajo Reservation, a random sample of 222 permanent dwellings in the Fort Defiance region showed that 56 were traditional Navajo hogans. In the Indian Wells region, a random sample of 141 permanent dwellings showed that 17 were traditional hogans. Let p1 be the population proportion of all traditional hogans in the Fort Defiance region, and let p2 be the population proportion of all traditional hogans in the Indian Wells region. Find a 90% confidence interval for p1 − p2. (Round your answer to three decimal places.) lower limit upper limit
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On the Navajo Reservation, a random sample of 226 permanent dwellings in the Fort Defiance region showed that 50 were traditional Navajo hogans. In the Indian Wells region, a random sample of 141 permanent dwellings showed that 21 were traditional hogans. Let p1 be the population proportion of all traditional hogans in the Fort Defiance region, and let p2 be the population proportion of all traditional hogans in the Indian Wells region. (a) Find a 90% confidence interval for p1 – p2. (Use 3 decimal places.) lower limit upper limit

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