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Stats Week 1

by: Sydney Veatch

Stats Week 1 SDS 302

Sydney Veatch
GPA 3.9

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About this Document

These brief notes cover an intro to Z scores and tables along with the practice problems and answers
Statistics Data Analysis
Class Notes
Statistics, intro to statistics, Math, Stats 311
25 ?




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This 4 page Class Notes was uploaded by Sydney Veatch on Thursday September 15, 2016. The Class Notes belongs to SDS 302 at University of Texas at Austin taught by in Fall 2016. Since its upload, it has received 30 views. For similar materials see Statistics Data Analysis in Math at University of Texas at Austin.


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Date Created: 09/15/16
Z SCORES AND TABLE NOTES AND PRACTICE Z-Scores -measure of how many standard deviations there are between a data value and the mean Z= x-μ(mean of population) / σ (standard deviation)      EX; $247 skis  Mean­ $279  SD= $16    Z= 247­279 /16  Z=­2   The price of the skis are 2 standard deviations below the mean      Z­Table  ­used to find the proportion that falls to the left of the mean     Ex: find the proportion when the z score is less that 2.47  =.9932    99.32 percent of the data was 2.47 standard deviations away      Ex: find the proportion where z is greater than 1.53  1­.937=.063  6.3% of the data is greater than 1.53 sd's away Average Hrs sleep= 6 hrs Sd=1.3 A) z=-1.6, how many hours? -1.6= (x-6) / 1.3 3.92 Hours B) prop. > 4 hours Z= (4-6)/1.3 Z= -1.54 93.82% of all sleep is over 4 hours C) prop between 6.5 &7.5 hours Z=(6.5-6)/1.3 & (7.5-6)/1.3 Z=.38 & 1.15 22.69%


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