Diff rel gof-fit - jejit - practice
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The document discusses three statistical concepts - difference, relationship, and goodness of fit. It provides examples to illustrate each concept. Difference refers to comparing two or more groups, such as younger and older drivers' average driving speeds. Relationship examines whether a change in one characteristic causes a change in another, like the relationship between age and flexibility. Goodness of fit determines how well a claim fits reality, such as a salesman's claim about software usage matching results from a sample of employees.
Diff rel gof-fit - jejit - practice
- 1. Difference – How do two or more groups (younger/older drivers) compare with one another (in terms of their average driving speed)? Central Tendency, Spread, or Symmetry? Relationship – Does an increase in one characteristic (age) cause a change in another characteristic (flexibility)? Goodness of Fit – Does your claim (4 out of 5 dentist recommend flavored floss) fit reality (3 out of 5 of my dentists recommend flavored floss)?
- 3. Difference Relationship Goodness of Fit Does employee moral increase significantly the longer they work at this company? You sample a group of 45 and generalize the results.
- 4. Difference Relationship Goodness of Fit Does employee moral increase significantly the longer they work at this company? You sample a group of 45 and generalize the results.
- 5. Difference Relationship Goodness of Fit Does employee moral increase significantly the longer they work at this company? You sample a group of 45 and generalize the results. Relationship – Does an increase in one characteristic (age) cause a change in another characteristic (flexibility)?
- 6. Difference Relationship Goodness of Fit Does employee moral increase significantly the longer they work at this company? You sample a group of 45 and generalize the results. Relationship – Does an increase in one characteristic (age) cause a change in another characteristic (flexibility)?
- 7. Next Example
- 8. How do management and staff compare in terms of work satisfaction? You sample both groups and generalize the results. Difference Relationship Goodness of Fit
- 9. How do management and staff compare in terms of work satisfaction? You sample both groups and generalize the results. Difference Relationship Goodness of Fit
- 10. How do management and staff compare in terms of work satisfaction? You sample both groups and generalize the results. Difference Relationship Goodness of Fit Difference – How do two or more groups (younger/older drivers) compare with one another (in terms of their average driving speed)?
- 11. How do management and staff compare in terms of work satisfaction? You sample both groups and generalize the results. Difference Relationship Goodness of Fit Difference – How do two or more groups (younger/older drivers) compare with one another (in terms of their average driving speed)?
- 12. Final Example
- 13. A salesman claims that 95% of employees increase their work productivity using his software. You test that claim with a sample of 26 employees and find that 86% increase their productivity. Difference Relationship Goodness of Fit
- 14. A salesman claims that 95% of employees increase their work productivity using his software. You test that claim with a sample of 26 employees and find that 86% increase their productivity. Difference Relationship Goodness of Fit
- 15. A salesman claims that 95% of employees increase their work productivity using his software. You test that claim with a sample of 26 employees and find that 86% increase their productivity. Difference Relationship Goodness of Fit Goodness of Fit – Does your claim (4 out of 5 dentist recommend flavored floss) fit reality (3 out of 5 of my dentists recommend flavored floss)?
- 16. A salesman claims that 95% of employees increase their work productivity using his software. You test that claim with a sample of 26 employees and find that 86% increase their productivity. Difference Relationship Goodness of Fit Goodness of Fit – Does your claim (4 out of 5 dentist recommend flavored floss) fit reality (3 out of 5 of my dentists recommend flavored floss)?