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Statistics (14)
STAT 1770 (14)
Lecture

September 30.docx

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School
University of Lethbridge
Department
Statistics
Course
STAT 1770
Professor
John Sheriff
Semester
Fall

Description
September 30, 2013 Chapter 5 Sec 1­4; pgs 110­126 Chapter 6 Sec 1­4, pgs 149­165 Finding Normal  Percentiles • N(1152 ,82)  o (Mean,  SD)  • A) Over 1250 o Z= (1250­1152) / 84   1.167 • B) Between 1000 and 1100  pounds o About 23.39%  1­.732­.035  =.233 • C) Cutoff for The lowest 20% of  weights o Z= ­0.84 o ­0.84 =Y­1152 / 84   Y=1152 • ­.084 x 84 o ~ 1081 • Cutoff for middle 40% of weights o Use Stat Crunch to find the 30% cutoff (44lbs on each side)  Between 1196 and 1108 Tires­ Exercise 5.48 • Tire manufacturer believes that the tread life of its snow tires is describe by a  Normal model with mean of 32,000 miles and SD of 2500 miles.  o A) If you buy one of these tires, would it be reasonable for you to hope it  lasts 4
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