1 / 14

Statistics & Research

Statistics & Research. General Background. Importance of Statistics Numbers are powerful Understanding research Conducting research Software SPSS Excel. Variables. Variable – something that can take on more than one value Independent variable – explains or causes

amela-herring
Download Presentation

Statistics & Research

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Statistics & Research

  2. General Background • Importance of Statistics • Numbers are powerful • Understanding research • Conducting research • Software • SPSS • Excel

  3. Variables • Variable – something that can take on more than one value • Independent variable – explains or causes • Dependent variable explained or effect

  4. Example Sex Eye color Class standing Age Height Weight Visualization SAT-Verbal Curiosity Possible values Female, male Blue, brown, green Fr, soph, jr., sr. 6, 19, 25, 70 (years) 60, 72, 84 (inches) 79, 101, 220 (lbs) 1.5, 2.0, 3.0 (secs) 500, 600 (scores) 40, 50, 60 (scores) Examples of Variables

  5. Population & Sample • Population – the complete collection; everyone of interest (adults in U.S.; students at USF) • Sample – a subset of the population (students at USF are a sample of adults in U.S.; student in this class are a sample of students at USF). We usually do research with a sample. Quick and cheap. Using the population is too costly.

  6. Parameter & Statistic • Parameter – a numerical summary of the population (average age of students at USF if students at USF is the population). • Statistic – a numerical summary of a sample (average age of students in this class if students at USF is the population). • Sample statistics serve 2 purposes: • Descriptive • Inferential

  7. Relations among Terms

  8. Review Definitions • Population • Sample • Parameter • Statistic

  9. Types of Studies • Design – set of data collection procedures • Experiment (Experimental study) • IV manipulated; often random assignment • Correlational study • IV measured, not manipulated

  10. Experiment • Independent Variable • schedule • Dependent Variable • Rph • Extraneous Variable(s) • Sex of experimenter • marble

  11. Another Example • Brannick wants to know if beer consumption the night before an exam is related to exam scores the following day. He asks each student taking an exam the number of beers they had the night before and calculates the total score to see relationship. • Experimental or correlational? • IV? DV? Extraneous (nuisance)?

  12. Definition • The way in which a study is set up and conducted is known as the study’s • Conduct • Design • Operation • Transport

  13. Definition • In an experimental study, the ___________ variable is usually deliberately manipulated. • Dependent • Extraneous • Independent • Nuisance

  14. Definition • We want to know about a large group of people, but we can only afford to study a small group of people. In statistics, the larger group is called the • Focus • Generalization • Population • Sample

More Related