Answered: The Environmental Protection Agency has…

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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Question

9.21) The Environmental Protection Agency has collected data on the LC50 (concentration killing 50% of the test animals in a specified time interval) measurements for certain chemicals likely to be found in freshwater rivers and lakes. For a certain species of fish, the LC50 measurements (in parts per million) for DDT in 12 experiments yielded the following:

16, 5, 21, 19, 10, 5, 8, 2, 7, 2, 4, 9

Assuming such LC50 measurements to be approximately normally distributed, estimate the true mean LC50 for DDT with a confidence coefficient of 0.90.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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