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Seminar 6

Seminar 6. By Zachary H. Cohle. I stole it off a site: so it’s an observational study. How was this data produced?. Is this result a sample or for an entire population?. Wrong: It’s a sample. P. The people!. What are some sources of Bias?.

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Seminar 6

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  1. Seminar 6 By Zachary H. Cohle

  2. I stole it off a site: so it’s an observational study. • How was this data produced? • Is this result a sample or for an entire population? Wrong: It’s a sample.

  3. P

  4. The people! • What are some sources of Bias? • Give some reasons why this data cannot be trusted. ‘Cause people are liars.

  5. Center? Spread? Shape?

  6. When talking about the spread, what jumps out at you. Descriptive Statistics: Ages of Men Variable N N* Mean SE Mean StDev Minimum Q1 Median Q3 Ages of Men 84 0 31.179 0.983 9.013 19.000 23.000 28.500 38.750 Variable Maximum Ages of Men 50.000 Descriptive Statistics: Ages of Women Variable N N* Mean SE Mean StDev Minimum Q1 Median Q3 Ages of Women 84 0 29.79 1.78 16.30 18.00 22.00 24.00 31.00 Variable Maximum Ages of Women 99.00 That’s right! The StDev is higher for females; therefore their ages vary more!

  7. Center? Spread? Shape?

  8. Look at the Stem and Leaf • Is the Male’s graph skewed at all? • How ‘bout the Female’s graph? • What ages of Females are most common? • How ‘bout Males? • Are the Female numbers more spread out than the Males?

  9. Finished

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