The Normal Distribution Normalor Gaussiandistributions are a family of symmetrical, bell shaped density curves defined by a mean (mu) and a standard deviation (sigma): N (, ).
Pictorially speaking, a
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Describing Distributions Numerically Measures of Center: The mean or arithmetic average To calculate the average, or mean, add all values, Heights of 25 Women then divide by the number of
Relationships between two categorical variables Examples: Is gender or race related to political preference? What type of music makes people relax best? Are people who make more money more satisfied w
What is Statistics? (Day 1) Statistics: the science of collecting, organizing, and interpreting data.
Population Inference about population (using statistical tools) Sample of data
To utilize statisti
Answer key No.1 to selected homework problems: Math. 61 1.7 1. Suppose the formula for n and try to prove the formula for n + 1: 1(1!) + 2(2!) + + n(n!) + (n + 1)(n + 1)!) = (n + 1)! 1 + (n + 1)(n + 1
Answer key of First Midterm Examination, Math 61, Version 2 1. Let X be an n element set. How many ordred pairs (A, B ) of subsets of X satisfy A B X . Answer 3n . Read Example 1.6 page 110 in the tex
Math.61/1 First Midterm Exam. Announcement
Date, Time and Place Monday January 26, 1:00 p.m. to 1:50 pm, in the LAKRETZ 110 (not the usual class room). Exam Rules:
Calculators are allowed in the thr
The t-distribution Previously, for the sake of convenience, we have been assuming that when dealing with normal models for quantitative data that either , or , or both are known. In practice, this is
Probability Models A Bernoulli Trial A random variable X is a Bernoulli random variable (or Bernoulli trial) if the following conditions are met: X has only two possible outcomes (called success and f
Randomness and Probability Models Randomness and Probability A phenomenon is random if individual outcomes are uncertain, but a regular distribution of outcomes emerges with a large number of repetiti
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Describing Distributions Numerically Measures of Center: The mean or arithmetic average To calculate the average, or mean, add all values, Heights of 25 Women then divide by the number of