Chapter 7 Part 2 - Skeleton

# Chapter 7 Part 2- - Psy250 Scientific Inquiry Chapter 7 Asking People About Themselves Survey Research Notes About Attendance Assignment from Last

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Notes About Attendance Assignment from Last Class *you agree that president Obama should focus his primary attention on the economy and foreign affairs? Problem:-loaded/double barreled Should Obama focus his primary attention on the economy or foreign affairs?
Sampling From A Population Most research projects involve sampling participants from a population of interest Population: all individuals of interest to a researcher - The group of individuals from which a sample is drawn.

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Sampling From A Population Occasionally a survey researcher might contact everyone in the population they are studying -Ex. U.S Census( population of interest is every person living in the U.S). -E.X students taking psy250 with Briana Harris in summer 2010. -and other relatively small populations.
Sampling From A Population In most cases studying everyone from a population of interest would be a massive (and impossible) undertaking Luckily… - With proper sampling we can use a subset of the population to estimate what the population is like.

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Confidence Intervals * Your best estimate of a population is the sample But since you have a sample, not the whole population, your result may be in error Confidence interval gives you information about likely amount of error Confidence interval: an interval of values within which there is a given level of confidence where the population value lies. -a.k.a. sampling error, margin of error Calculated based on sample size
Sample Size Several factors determine confidence interval - sample size! Larger sample size reduces size of confidence interval - Larger samples will yield data that accurately reflects population Sample size is not just a constant percentage of the population size

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Sampling Techniques Probability Sampling: each member of the population has a specifiable probability of being chosen
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## This note was uploaded on 03/10/2011 for the course PSY 250 taught by Professor Briannalharris during the Summer '10 term at State University of New York.

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Chapter 7 Part 2- - Psy250 Scientific Inquiry Chapter 7 Asking People About Themselves Survey Research Notes About Attendance Assignment from Last

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