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Homework Quiz 8/21

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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Homework Quiz 8/21

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  1. 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

  2. Statistical Thinking Section 1-2

  3. Statistical Thinking • Context • Source • Sampling Method • Conclusions • Practical Implications

  4. Statistical Thinking • Context • Source • Sampling • Conclusions • Practical Implications

  5. 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.

  6. Statistical Thinking • Context • Source • Sampling Method • Conclusions • Practical Implications

  7. 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?

  8. Statistical Thinking • Context • Source • Sampling Method • Conclusions • Practical Implications

  9. 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?

  10. Statistical Thinking • Context • Source • Sampling Method • Conclusions • Practical Implications

  11. 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.

  12. Statistical Thinking • Context • Source • Sampling Method • Conclusions • Practical Implications

  13. 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?

  14. Homework • P.10: 15-18

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