A municipal wastewater treatment facility discharges to a river. During dry weatherconditions the river is sampled for total phosphorus (mg/L) above and below the dischargelocation. Can we conclude that the downstream phosphorus level is significantly greaterthat the upstream level at a 95% confidence intervalSHOW ALL STEPSTOTAL P - mg/LUPSTREAM9.0 11 10 12 12 15 9.5 10 8.5 9.9DOWNSTREAM 10 14 12 25 19 22 10 21 22 10 14

Given: n1 = 10 n2 = 11 Confidence level = 95% Significance level α = 0.05 Formula Used:…

Answered: A municipal wastewater treatment…

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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Table 3: Significant Influence between Management Capability of Administrators and Productivity of Employees Leadership Skills Productivity of Employees Beta t-value p-value Skills .624** 1.56 .000 Knowledge .456** 4.25 .000 Aptitudes .552** 4.22 .000 R2 =.639 Evalue=6.45 p value=.000 Present, analyze and interpret the data. Make inference at the end of your discussion
Medical research has shown that repeated wrist extensions beyond 20 degrees increase the risk of wrist and hand injuries. Each of 24 students at a university used a proposed new computer mouse design, and while using the mouse, each student's wrist extension was recorded. Data consistent with summary values given in a paper are given here. 27 22 29 24 27 27 25 25 24 24 24 25 28 25 24 28 27 26 31 25 28 27 27 25 USE SALT (a) Use these data to estimate the mean wrist extension for people using this new mouse design using a 90% confidence interval. (Round your answers to three decimal places.)
Hoaglin, Mosteller, and Tukey (1983) presented data on blood levels of beta-endorphin as a function of stress. They took beta-endorphin levels for 19 patients 12 hours before surgery and again 10 minutes before surgery. The data are presented below, in fmol/ml Construct a 95% confidence limits on the true mean difference between endorphin levels at the two times described. Participant 12 hours before 10 minutes before 1 10 6.5 2 6.5 14.0 3 8.0 13.5 4 12 18 5 5.0 14.5 6 11.5 9.0 7 5.0 18.0 8…
Suppose we are making predictions of the dependent variable y for specific values of the independent variable x using a simple linear regression model holding the confidence level constant. Let Width (C.I) = the width of the confidence interval for the average value y for a given value of x, and Width (P.I) = the width of the prediction interval for a single value y for a given value of x. Which of the following statements is true? Width (C.I) = 0.5 Width (P.I) Width (C.I) = Width (P.I) Width (C.I) > Width (P.I) Width (C.I) < Width (P.I)
Age x and resting heart rate y were sampled for 25 randomly selected children from age 2 to 9. Summary information is: n = 25, Σx = 140.5, Σx2 = 903.75, Σy = 2567, Σy2 = 264, 457, Σxy = 14, 171.5 (a) Compute a 95% confidence interval for the average resting heart rate of 3 six year old children.
The pulse rates of 168 randomly selected adult males vary from a low of 39 bpm to a high of 111 bpm. Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want 98% confidence that the sample mean is within 2 bpm of the population mean. Complete parts (a) through (c) below
Medical research has shown that repeated wrist extensions beyond 20 degrees increase the risk of wrist and hand injuries. Each of 24 students at a university used a proposed new computer mouse design, and while using the mouse, each student's wrist extension was recorded. Data consistent with summary values given in a paper are given here. 27 27 23 26 27 25 25 24 22 25 24 28 27 26 31 25 USE SALT 24 24 25 28 28 27 27 25 (a) Use these data to estimate the mean wrist extension for people using this new mouse design using a 90% confidence interval. (Round your answers to three decimal places.) 25.148 26.518 ]× )
MO21. A particular brand of diet margarine was analyzed to determine the level of polyunsaturated fatty acid (in percentages). A sample of six packages resulted in the following data: 12.8, 14.3, 11.1, 16, 13.5, 12. Calculate the 99% confidence interval on the population mean but input only the value of the upper limit of the Cl in the blank provided up to 2 decimal places. Provide all the necessary solutions in the submission for both upper and lower limit. 10 Upper limit of the Cl is Blank 1. Blank 1 Add your answer
Are juvenile defendants who are released pending adjudication processed more slowly than those who are detained? The JDCC data set records whether a juvenile was released and the number of months it took for that juvenile’s case to reach a disposition. The sample will be narrowed to black female youth. Released juveniles (Sample 1) had a mean of 4.30 months to disposition (s = 3.86, N = 123) and detained juveniles (Sample 2) had a mean of 3.57 (s = 4.20, N = 64). Using an alpha level of .01, test the hypothesis that released juveniles’ mean time-to-adjudication is significantly greater than detained juveniles’ mean. Assume equal population variances. Use all five steps.
The article "Approach to Confidence Interval Estimation for Curve Numbers" (R. McCuen, Journal of Hydrologic Engineering, 2002:43-48) discusses the relationship between rainfall depth and runoff depth at several locations. At one particular location, rainfall depth and runoff depth were recorded for 13 rainstorms. Following is MFNITAB output for a fit of the least-squares line to predict runoff depth from rainfall depth (both measured in inches). The regression equation is Runoff =-0.23 + 0.73 Rainfall Predictor Coef SE Coef тР Constant -0.23429 0.23996 -0.98 0.350 Rainfall 0.72868 0.06353 11.47 0.000 S= 0.40229 R-Sq = 92.3% R-Sq(adj) = 91.6% Analysis of Variance Source Regression 121.290 21.290131.550.000 Residual Епог SS MS F P 11 1.7800.16184 Total 1223.070 a Predict the runoff for a storm with 2.5 in. of rainfall. b. Someone claims that if two storms differ in their rainfall by 1 in, then their runoffs will differ, on the average, by 1 in. as well. Is this a plausible claim?…
As a project site civil engineer, you will evaluate the production and process of the concrete producers. You will find that whether the concrete is too watery or not. From the data, the contract specification state that the slump for the concrete used should be 1 inch, with a 90% level of confidence(hint: this is redundant given). So, we will take 10 random samples of fresh concrete and measure the slump. Data: 0.95 1.21 1.03 1.10 1.01 0.99 0.89 0.97 1.01 0.99 Test the hypothesis that mean concrete is different from 1 inch at 10% or 0.10 level of significance. HINT: t-test: two-tailed test. Specify and Use 6 steps method.
Find the a/2 ( the area in one tail outside of the confidence interval) and the critical value z a/2 necessary to construct an 80% confidence interval.

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