STAT 2507A – Week 2

STAT 2507A – Week 2 - STAT2507AWeek2...

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1 STAT 2507A – Week 2 Jerry Situ 2.1 – 2.7  Summery 2009
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Questions from last class Method of left inclusion:  Include the left class boundary point but not the right  class boundary point. Ex: sample values: 8.5,9.00001, 8.9999, 9.0000, 10.7 2 Class range [8, 9) AKA: from 8 up to  but not including 9 AKA: 8 ≤ x < 9 [9,10) AKA: from 9 up to  but not including  10 AKA: 9 ≤ x < 10 Values in the range 8.5 8.9999 9.00000 9.00001 NOTE: Do not need to follow method of left inclusion as long as you properly specify  where the boundary points are included. May need to not use Method of left inclusion  sometimes.
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Question from last class (2) Log 10 (10 x ) = X, Log e (e x ) = x Log 2 k  = k Log 2 IF x = y THEN log(x) = log(y) For the empirical rule to determine number of classes  in histogram, it does not matter which base log you  use. 2 k  ≥ N, then k log(2) ≥ log(N), k ≥ log(N)/log(2) 3
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Exercise on week 1 Scenario:  you are interested in finding out the height of new born  babies in Ottawa by doing a telephone survey. Realizing that a new  born baby is unlikely to be able to tell you their height, you decide to  ask their mothers. You randomly choose a few houses in Ottawa, and  ask them if they have a new born baby. If so, you ask the mother the  height of the baby. What is the Population:  A) Mother with new born babies in Ottawa B) New born babies in Ottawa C) Houses with new born babies in Ottawa What is the Sample: A) Subset of mother with new born babies in Ottawa B) Subset of new born babies in Ottawa C) Subset of houses with new born babies in Ottawa What type of variable are you collecting: A) Quantitative, discrete; B) Quantitative, continuous; C) Qualitative 4
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Exercise on week 1(2) 5 Source: Statistics Canada What proportion of  individuals earn $70K or  more in 2005: A) 7% B) 3% C) 10% What proportion of  individuals earn less than  $70K in 2005: A) 4.5% B) 90% C) 10% Annual individual Income, 2005 Income distribution of individuals with income, 2005 (n = 24.4 million individuals)
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histogram Shows the proportion of observations in  each class X-axis is the variable values (in  categories for discrete variable). Y-axis shows the proportion of  observations with the x-axis value. Area under the curve = 100%
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This note was uploaded on 05/24/2011 for the course STAT 2507 taught by Professor Masoudmollaalizadehnasari during the Summer '09 term at Carleton CA.

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STAT 2507A &amp;acirc;€“ Week 2 - STAT2507AWeek2...

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