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.

----- 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...