Periodically, the county Water Department tests the drinking water of homeowners for contaminantssuch as lead and copper. The lead and copper levels in water specimens collected in 1998 for asample of 10 residents of a subdevelopement of the county are shown below.lead (g/L)2.90.25.14.25.51.20.1330.7740.2140.6710.4440.2340.3570.7610.1760.888(a) Construct a 99% confidence interval for the mean lead level in water specimans of thesubdevelopment.OSMOSOcopper (mg/L)0.31.34.91.7(b) Construct a 99% confidence interval for the mean copper level in water specimans of thesubdevelopment.OSHSO

Answered: Periodically, the county Water…

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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In a study of the effect of subbase thickness on the amount of surface deflection caused by aircraft landing on an airport runway, simulated Boeing 747 landing gear was trafficked across four sections of runway. Then simulated Boeing 777 landing gear was traf- ficked across four sections of runway. The surface deflection for each trial is listed below. 5. Boeing 747 Boeing 777 4.01 3.87 3.72 3.76 4.57 4.48 4.36 4.43 Compute an appropriate 95% confidence interval for the difference in mean surface deflec- tion for a Boeing 777 vs a Boeing 747. State any additional assumptions that you need to make. You may use Minitab or other software for this problem, but you must show enough steps that it is clear that you understand the procedure(s) you are using.
A scale is tested by repeatedly weighing a standard 9.0 kg weight. The weights for 8 measurements are 8.9,8.6,8.0,8.2,8.3,8.5,8.2,9.3 mean:
1. The 50 measurements of acid rain in Wisconsin, whose histogram is given on the cover page of the chapter, are 3.58 3.80 4.01 4.01 4.05 4.05 4.12 4.18 4.20 4.21 4.27 4.28 4.30 4.32 4.33 4.35 4.35 4.41 4.42 4.45 4.45 4.50 4.50 4.50 4.50 4.51 4.52 4.52 4.52 4.57 4.58 4.60 4.61 4.61 4.62 4.62 4.65 4.70 4.70 4.70 4.70 4.72 4.78 4.78 4.80 5.07 5.20 5.26 5.41 5.48 a. Calculate the median and quartiles. b. Find the 90th percentile. c. Determine the mean and standard deviation.
Use the following table for problems 1–10. The numbers represent the scores (in points) for a sample of 10 college basketball games: 66 49 32 57 35 57 39 41 33 31
110 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below: # of times floss per week Frequency Relative Frequency Cumulative Frequency 0 10 0.0909 10 1 20 0.1818 30 2 9 0.0818 39 3 11 0.1 50 4 13 0.1181 63 5 21 0.1909 84 6 11 0.1 95 7 15 0.1364 110 a. Complete the table (Use 4 decimal places when applicable) b. What is the cumulative relative frequency for flossing 3 times per week? %
Please help me in answering the following practice question:Given a random sample of the amount of protein (in gram) in one bag of snack food: 0.95, 0.85, 0.92, 0.95, 0.93, 0.86, 1, 0.92, 0.85, 0.81, 0.78, 0.93, 0.93, 1.05, 0.93, 1.06, 1.06, 0.96, 0.81, 0.96 Here, it is assumed that the amount of protein in the snack is normal. How would I calculate a 98% two-sided confidence interval for the average amount of protein in one bag?Thank you for your help in advance!
The tar content in samples of cigar tobacco follows: 1.542 1.585 1.532 1.466 1.499 1.611 1.622 1.466 1.546 1.494 1.548 1.626 1.44 1.608 1.52 1.478 1.542 1.511 1.459 1.533 1.532 1.523 1.397 1.487 1.598 1.498 1.6 1.504 1.545 1.558 1.555 1.712 1.442 1.443 1.699 1.701 1.698 1.88 1.11 1.21 1.987 1.39 Find a 90% Cl on the mean tar content. Choose 2 answers from the choices below for the values of upper and lower limits. Do not round off the values until you got the final answers. 1.483 O 1.525 1.577 1.568 O 1.598 O 1.513 O 1.580 O 1.504

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X	Y
2.9	0.133
0.2	0.774
5.1	0.214
4.2	0.671
5.5	0.444
1.2	0.234
0.3	0.357
1.3	0.761
4.9	0.176
1.7	0.888