Suppose that you go to a NJ lake to grab water samples to test algal concentrations using a cellcounter. That instrument is certified to have a minimum detectable relative difference of 10%. Thewater sample testing result shows that the mean algal number is 1500 #/ml with a standarddeviation of 250 #/ml. Roughly how many samples are required at least to be collected at aconfidence level of 95% and power of 90%?O 5O 10O 15O 21

Given information- Population standard deviation, σ = 250 ml Confidence interval = 0.95 Significance…

Answered: Suppose that you go to a NJ lake to…

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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Given the supplied information, interpret the results. Be sure to (1) tell what was done, (2) present some facts, (3) interpret the results, and (4) make a suggestion for future research. (Assume the test is two-tailed and a =.05). A statistics professor has compared the systolic blood pressure of her class (N = 24) (M = 138, s = 16) to blood pressure in the general population (u = 120) to see if taking statistics is related to higher or lower blood pressure. She found: - tcv = 2,069 -t= 5.50 •d3 1.13 •r2357% - 95% Clpir [11.23, 24.77] 整

The General Survey data shows that the mean age at first childbearing for women (N = 625) is 24.12 with the standard deviation of 5.05. For men (N = 576), the mean age at first childbearing is 27.67 with the standard deviation of 5.42. If you want to test whether there differences between women (Sample 1) and men (Sample 2) in the population, the alternative hypothesis %3D would be: Ο Η1: μ1 p2 O H1: µ1 # 5.05 H1: u1 # µ2 O O A 40 e here to search
Question 1
Consider a large population with?=67 and ?=6. Assuming ?/?≤0.05, find the mean and standard deviation of the sample mean, x ,a. for a sample of size 21 ux= ox= b. For a sample of size 62 ux= ox=
In a set of experiments, a physicist makes multiple independent measurements of an electric field. In total, 1600 measurements are made, and we find that the standard deviation of the measurements is 2 V/m, and the mean is 100.0 V/m. Measured in Volts per metre, what is the width of the 95% confidence interval for the value of the field?
4
A population has a mean μ = 73 and a standard deviation o = 28. Find the mean and standard deviation of a sampling distribution of sample means with sample size n = 257. Hx ox (Simplify your answer.) (Type an integer or decimal rounded to three decimal places as needed.)
For a population with mean of 50 and standard deviation of 8, what is the raw score that corresponds to z=0.75? 56 b. 46 C. 42 d. 70 е. 52 a.
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.78. (c) How large a sample size is necessary if the width of the 95% interval is to be 0.31? (Round your answer up to the nearest whole number.) ? specimens (I have answers for a, b, and d I just need help with c, the answer is not 24.32)
2. The difference between the two groups has been declared statistically significant at the a = 0.05 level. Use the "No Adolescent Marijuana" group to determine a suitable p0, and then test the hypothesis: HO: p ≤ p0 HA: p > p0 where p is the population proportion (conceptualized) of all adolescent marijuana users who would develop schizophrenia. Show all your work. Are the results statistically significant as claimed? Make sure you report the standard score, a p-value, your conclusion, and a comment on what statistical risk has been taken and controlled for in this testing process. Percent Developing Schizophrenia 7%- 6%- 5%- 4% 3%- 2%- 1%- 0%- A Particular COMT Gene and Psychosis 2.3% No Adolescent Marijuana Use (n=311) 5.5% Adolescent Marijuana Use (n=91)

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