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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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• 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

• Context

• Source

• Sampling Method

• Conclusions

• Practical Implications

• Context

• Source

• Sampling

• Conclusions

• Practical Implications

• 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.

• Context

• Source

• Sampling Method

• Conclusions

• Practical Implications

• 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?

• Context

• Source

• Sampling Method

• Conclusions

• Practical Implications

• 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?

• Context

• Source

• Sampling Method

• Conclusions

• Practical Implications

• 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.

• Context

• Source

• Sampling Method

• Conclusions

• 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?

• P.10: 15-18