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Get Full Access to Introduction To Probability And Statistics 1 - 14 Edition - Chapter 15.7 - Problem 41
Get Full Access to Introduction To Probability And Statistics 1 - 14 Edition - Chapter 15.7 - Problem 41

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# Toxic Chemicals An experiment wasconducted to compare the effects of three ISBN: 9781133103752 255

## Solution for problem 41 Chapter 15.7

Introduction to Probability and Statistics 1 | 14th Edition

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Problem 41

Toxic Chemicals An experiment wasconducted to compare the effects of three toxicchemicals, A, B, and C, on the skin of rats. One-inchsquares of skin were treated with the chemicals andthen scored from 0 to 10 depending on the degree ofirritation. Three adjacent 1-inch squares were markedon the backs of eight rats, and each of the three chemicalswas applied to each rat. Thus, the experiment wasblocked on rats to eliminate the variation in skin sensitivityfrom rat to rat.Rats12 3456 78BA ACBC CB59 6685 57AC BBCA BA64 9885 76CB CAAB AC39 3577 67a. Do the data provide sufficient evidence to indicate adifference in the toxic effects of the three chemicals?Test using the Friedman Fr-test with a .05.b. Find the approximate p-value for the test and interpretit.

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----- Lecture 10/23/17 ----- → Section 5.3 ← x ~ N( μ, ��) → Z using Z = (x - μ )/�)� (Z ~ N(0,1)), using this to find probability (area) using:  Z - table,  Symmetry  Complement rules,  etc., Example: Mean = 174 Standard Deviation = 20 X = 200 → P(x < 200) = x ~ N(174, 200) → P((x - μ)/(�) < (200 - 174)/(20)) → P(z < 1.3) = 0.9032 Ex. 2.1 Mean = 174, Standard Deviation...

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##### ISBN: 9781133103752

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