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Statistical Methods.docx

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PSYC 2530
Matthew Sigal

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Statistical Methods Saturday, January 12, 2013 Chapter 1- Introduction and Descriptive Statistics 1.1 Statistics, Science, and Observation What is Statistics- Consists of facts and figures such as average income, crime rate, birth rate and etc. They are time saving and informative because they condense large quantities of information into a few simple figures. We use Statistics to refer a set of mathematical procedures Stats serve two general purposes - It is used to summarize and organize the information so researchers can see what happened but also communicate this information to others - Also to answer the question that they first purposed ex. Does violence on t.v affect a child’s behavior? Also what general conclusions can be justified based on results that are obtained Statistical procedures - help ensure information or observation is presented and interpreted in an accurate and informative way. -Bring order to chaos Information presented allows for scientific community to understand worldwide 1.2 Populations and Samples Researches usually start with a general question about a specific group (or groups) of individuals - Ex. Examine the amount of time spent in the bathroom for men compared to women - The researcher is comparing the group of men and group of women - The entire group that a researcher wishes to study is called a population,( is a set of all the individuals of interest in a particular study) A population can vary in size from small to large. ex you cannot use the entire race of women and men for the study above. So a researcher will narrow down his search by using only women who vote in the U.S. Humans are not the only people who can be considered for a population, you could use animals- rats, corporations, parts manufactured at a factory. Possibilities are endless Because populations tend to be very large it is im
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