# Lecture 2 - Sampling Distributions What's variability got...

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Sampling Distributions What’s variability got to do with it? 1

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Session ID: 920661 Push and hold “Menu” button for three seconds to turn unit on Should say “Enter session ID” If not, need to push arrow until it asks for session ID 2
Session ID: 920661 Type in “920661” You must push “Send” to send a signal 3

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Enter your ID Be sure to include leading zeros E.g., type “000365781” 4
True or False True or false questions are easy. 5

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Sample Information A sample is a piece of a big picture Can you infer the big picture from the sample? Sample 1 7

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Population The group of elements in which we are interested Example: all students registered in 6E:071 AAA Of interest: what proportion (p) of students have an ID with an odd last digit? 8
Sample A subgroup of the population Example: All 6E:071 students whose first name starts with “A” Of interest: what proportion ( ) of these students have an ID with an odd last digit?

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