Statistics

1 / 11

Statistics - PowerPoint PPT Presentation

Statistics. …a science a way of finding things out. Statistical Data. Found almost anywhere Exists in a variety of forms Assists us in making informed decisions when faced with uncertainty and without bias. Definition. Collection Organization Analysis

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

PowerPoint Slideshow about 'Statistics' - ramla

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Statistics

…a science

a way of finding things out

Statistical Data
• Found almost anywhere
• Exists in a variety of forms
• Assists us in making informed decisions when faced with uncertainty and without bias
Definition
• Collection
• Organization
• Analysis
• Interpretation of numerical information
Collect Data
• Samples
• Experiments
• Census
• Simulations
Organize
• Frequency tables
• Charts
• Graphs
Analyze
• Trends…As x increases, y does something
• Measures of central tendency
• Confidence Intervals
• Hypothesis Tests
Interpretation
• Assumptions
• P-value and Alpha level
• Confidence level
• Z score
• T score
• Written summary
Caution
• Can lie with our interpretation of statistics
• Work diligently to use statistics to show the entire picture and the truth…by good intentions and by skill (non-ignorance)
Population
• All measurements of interest…entire group of those being measured
• Data from all…
Sample
• Part of the population
• Smaller section of those being measured
• Data from…
• Random, representative sampling
Random Samples
• Uh, yeah…NO!
• Ages of students in Math 102 at Pepp
• Ages of students on volleyball team
• Ages of students in Stewart hall dorms
• Ages of humans passing by Rockwell Academic Center
• Yesss!
• Random # Table w complete listing of st #s
• Calculator with complete list of sts
• Computer selects 30 from an alphabetical list