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Lecture 13 - Statisitics (Z-tables, regression)

# Lecture 13 - Statisitics (Z-tables, regression) - TODAYS...

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2/24/2010 1 TODAY’S TOPICS: Statistics: Part 2 Engr 160 Statistics How will learning this help me? Connecting to your Background • You will learn how to use the normal distribution to predict the likelihood of something – The Probability • You learn how to make a histogram—which tells you the frequency that something happens Engr 160

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2/24/2010 2 Probability • Engineers need to be able to determine the likelihood that an event will occur – What is the likelihood that the strength of a material will be less than a certain amount? – What is the likelihood that a machine part will fail before it’s intended lifetime? • How can we determine the probability of something? Engr 160 Probability • Step 1: Collect data • Step 2: Use a histogram to plot the data • Step 3: Determine the distribution of the data by looking at the histogram • Step 4: Use the area under the distribution curve to determine probability Engr 160
2/24/2010 3 How Does the Data Distribute? The more data added the better the distribution Engr 160 Probability Z tables Pg. 397 of the Eide text x x z Engr 160 S

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2/24/2010 4 Probability: Sample Problem
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Lecture 13 - Statisitics (Z-tables, regression) - TODAYS...

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