Homework Quiz 8/21

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# Homework Quiz 8/21 - PowerPoint PPT Presentation

Homework Quiz 8/21. Match the appropriate term to the correct definition. A: Collections of observations (such as measurements, genders, survey responses). B: Subcollection of members selected from a population C: The collection of data from every member of the population

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Presentation Transcript
Homework Quiz 8/21
• Match the appropriate term to the correct definition

A: Collections of observations (such as measurements, genders, survey responses).

B: Subcollection of members selected from a population

C: The collection of data from every member of the population

D: The complete collection of all individuals to be studied.

Data

Census

Sample

### Statistical Thinking

Section 1-2

Statistical Thinking
• Context
• Source
• Sampling Method
• Conclusions
• Practical Implications
Statistical Thinking
• Context
• Source
• Sampling
• Conclusions
• Practical Implications
Context
• Consider the following data (page 5)
• We need to know what this represents
• Context is what the values represent, where they came from, and why they were collected.
• These values represent freshman Rutgers students’ weights at the beginning and end of the school year. The purpose is to test if the Freshman 15 is a real thing.
Statistical Thinking
• Context
• Source
• Sampling Method
• Conclusions
• Practical Implications
Source
• The source of the data is who is collecting the data.
• In our example, the source is the Rutgers University Department of Nutritional Sciences.
• Is this a reliable source?
• An unreliable source: A shoe polish company doing a study on whether or not scuffed shoes at an interview could lead to not getting the job.
• Why?
Statistical Thinking
• Context
• Source
• Sampling Method
• Conclusions
• Practical Implications
Sampling Method
• The sampling method used is how the data is collected.
• Voluntary Response: Participants get to choose if they want to be involved. (Less Reliable)
• Random Sampling: A method is used to collect data randomly from the population. (More Reliable)
• In the study we’ve been talking about, 217 students were weighed in the fall and asked to come back in the Spring. Only 67 of these students chose to return.
• Why does this taint our results?
Statistical Thinking
• Context
• Source
• Sampling Method
• Conclusions
• Practical Implications
Conclusions
• Conclusions should be based on the statistical analysis only, and should be stated in ways that people with no understanding of statistics should be able to understand.
• The researchers in our study concluded that the freshman 15 was a myth.
Statistical Thinking
• Context
• Source
• Sampling Method
• Conclusions
• Practical Implications
Practical Implications
• Practical implications are what the data really means for the people it relates to.
• Practical Implications vs. Statistical Significance
• In a test on whether the Atkins diet works, the data showed that the average participant lost 2 lbs a year.
• Statistically, this shows that the diet is effective.
• Realistically, what are the implications?
Homework
• P.10: 15-18