Homework quiz 8 21
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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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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

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

Data

Census

Sample


Statistical thinking

Statistical Thinking

Section 1-2


Statistical thinking1

Statistical Thinking

  • Context

  • Source

  • Sampling Method

  • Conclusions

  • Practical Implications


Statistical thinking2

Statistical Thinking

  • Context

  • Source

  • Sampling

  • Conclusions

  • Practical Implications


Context

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 thinking3

Statistical Thinking

  • Context

  • Source

  • Sampling Method

  • Conclusions

  • Practical Implications


Source

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 thinking4

Statistical Thinking

  • Context

  • Source

  • Sampling Method

  • Conclusions

  • Practical Implications


Sampling method

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 thinking5

Statistical Thinking

  • Context

  • Source

  • Sampling Method

  • Conclusions

  • Practical Implications


Conclusions

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 thinking6

Statistical Thinking

  • Context

  • Source

  • Sampling Method

  • Conclusions

  • Practical Implications


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

Homework

  • P.10: 15-18


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