3. Sewage and industrial pollutants dumped into a body of watercan reduce the dissolved oxygen concentration and adverselyaffect aquatic species. In one study, weekly readings are takenfrom the same location in a river over a 2-month period.Weeknumber1234Dissolved O₂ppm4.95.16.54.3Weeknumber5678DissolvedO₂ ppm4.74.94.55.1Some scientists think that 5.0 ppm is a dissolved O, level that ismarginal for fish to live Conduct a statistical test to determinewhether the mean dissolved oxygen concentration is less than5.0 ppm. All calculations are at 95% CL

Data ; 4.9,5.1,6.5,4.3,4.7,4.9,4.5,5.1 First calculate mean and and standard deviation : Mean = 5…

Answered: 3. Sewage and industrial pollutants…

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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11.2.3
2. Calculate indicators of Hospitalized incidence of diseases in a given country for the current year. • To evaluate indicators and analyze their dynamics (compare data for the current year with data for 2000). ● Compare indicators for a given country with those for the European Region. Present the estimated data graphically (build diagrams). Make a conclusion. Countries Spain European Region Data for the current year (absolute numbers) Number of Number of outpatients with outpatients with coronary artery vascular brain Population 46423064 disease 132848 Incidence 845.6 (per 100,000) damage 101341 Incidence 446,7 (per 100,000) 2000 year (per 100,000 population) Hospitalized Hospitalized incidence of incidence of coronary vascular artery disease 363.5 738.1 brain damage 213.2 379.3
For each of the questions 1-4, answer the following (a-h are steps in a Hypothesis Test, see page 376 of your ebook). For steps f and g do both the p-value method and the critical value method: a) Claim in English: b) Claim in Symbolic Form: c) Null and Alternate Hypothesis: d) Significance Level: e) Test Statistic: f) Find Values: g) Make a Decision: h) Restate the Decision in Nontechnical Terms: i) If this is a statistically significant result, is it also a practically significant result?
Suppose that there is a correlation of r = 0.41 between the amount of time that each student reports studying for an exam and the student's grade on the exam. This correlation would mean that there is a tendency for people who study more to get better grades. Question 21 options: True False
1. Consider the following data collected regarding infant blood pressure, age, and birth weight: i 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Birth weight in oz. (x1) 135 120 100 105 130 125 125 105 120 90 120 95 120 150 160 125 Age in days (x2) 3 4 3 2 4 5 2 3 5 4 2 3 3 4 3 3 Systolic Blood Pressure mmHg (y) 89 90 83 77 92 98 82 85 96 95 80 79 86 97 92 88 a. Fit a model to predict SBP from birth weight and Age. Present the equation of the least-squares regression line. b. Interpret the beta coefficients for Birth weight and Age. c. Are Birth weight and/or Age significantly associated with SBP at the alpha = 0.05 level? d. Interpret the corresponding 95% confidence intervals for both Birth weight and Age.
At what glucose level cutoff would we identify 100 % of diabetics?
6. In a field experiment, the earth worm densities observed in different sites with varying soil moisture regimes are given below. Is there any relationship between the soil moisture and earth worm densities: Moisture % 6 25 12 8 16 20 30 22 27 31 Earth worm density (No./m2) 0 5 3 14 10 12 14 6
1) You test a new drug to reduce blood pressure. A group of 15 patients with high blood pressure report the following systolic pressures (measured in mm Hg): before medication: after medication: change: ̄y s187 120 151 143 160 168 181 197 133 128 130 195 130 147 193 157.53 27.409 187 118 147 145 158 166 177 196 134 124 133 196 130 146 189 156.40 27.060 0 2 4 -2 2 2 4 1 -1 4 -3 -1 0 1 4 1.133 2.295 a) Calculate a 95% CI for the change in blood pressure. b) Calculate a 99% CI for the change in blood pressure. c) Does either interval (the one you calculated in (a) or (b)) include 0? Why is this important? d) Now conduct a one sample t-test using μ = 0, and α = .05. Are the results consistent with (a)? Why or why not? e) Finally, conduct a one sample t-test using μ = 0, and α = .01. Are the results consistent with (b)? Why or why not?
6. Accidents on highways are one of the main causes of death or injury in developing countries and the weather conditions have an impact on the rates of death and injury. In foggy, rainy, and sunny conditions, 1/4, 1/8, and 1/21 of the accidents result in death, respectively. Sunny conditions occur 60% of the time, while rainy and foggy conditions each occur 20% of the time. Given that an accident without deaths occurred, what is the conditional probability that it was foggy at the time?
Please view attachemnet and submit answer.
4. A psychologist noted that people have more difficulty sleeping in a bright room than in a dark room. She measured whether the intensity of the light could predict the time it took a sample of four participants to fall asleep. The data for this hypothetical study are listed in the following table. Intensity of Light (X) Time it Took to sleep (Y) 5. 10 10 18 20 30 40 25 M = 18.75 M = 20.75 S= 15.48 S = 8.69 r= .68 Create a scatter plot of the data b. Calculater and r2 c. Report results in APA style. d. What do results mean? a.
i. ii. Table 1 iii. Top 15 countries with the highest wind power Country iv. Rank 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 China United States Germany United Kingdom India Brazil Spain France Canada Sweden Italy Turkey Australia Netherlands Mexico Gigawatt hours (GWh) 467037.4 341818.0 132102.0 75369.1 63522.3 57050.0 56444.0 39791.9 35638.0 27526.0 18676 14304 please solve iv only by minitabe 12080 10607 b. Construct a 95% confidence interval on the mean wind power. Calculate the sample mean and variance. Write the appropriate confidence formula and the assumptions. Calculate the confidence interval manually. Perform the analysis by Minitab. Copy your output and insert it into your report (use the latest Minitab version and do not write/type the output). 8951 7 4

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