DPC
October 14, 2020

# Week 10 Videocast Slide Deck

October 14, 2020

## Transcript

2. ### Examining relationships 03 Descriptive stats 02 Quantitative data recap 01

This Videocast

4. ### Quantitative Data Information that is systematically collected and communicated in

numerical form; Data that can be analyzed with mathematical (usually statistical) techniques
5. ### Levels of Measurement Nominal (aka Categorical) Ordinal Interval Ratio Descriptive

labels/ categories; no meaningful order to values Depict the order of a measurement, but not the difference between integers Depict the order and difference between integers (“interval” = distance between entities); No “true” zero Depict the order and difference between integers; “True” zero ✓ Genders ✓ Countries ✓ Cities ✓ Occupations ✓ Likert-scale survey responses ✓ “Star” ratings ✓ Interval/ratio data expressed as categories ✓ IQ Scores ✓ Temperature ✓ Age ✓ Income ✓ Budgets

7. ### Descriptive Statistics Analysis of data that helps describe, show or

summarize data in a meaningful way such that, for example, patterns might emerge from the data.
8. ### Counts Percentages Rates Ratios Measures of central tendency Measures of

dispersion Commonly Used Descriptive Statistics
9. ### Mean: Average value (sum/n) Median: Midpoint of a distribution (middle

number) Mode: Most frequent value Measures of Central Tendency Figures (numbers) that represent the “center” of the data
10. ### Levels of Measurement Nominal (aka Categorical) Ordinal Interval Ratio Descriptive

labels/ categories; no meaningful order to values Depict the order of a measurement, but not the difference between integers Depict the order and difference between integers (“interval” = distance between entities); No “true” zero Depict the order and difference between integers; “True” zero ✓ Mode ✓ Mode ✓ Median ✓ Mode ✓ Median ✓ Mean ✓ Mode ✓ Median ✓ Mean
11. ### Measures of Central Tendency \$75k \$65k \$50k \$50k \$30k \$30k

\$30k Mode = \$30k
12. ### Measures of Central Tendency \$75k \$65k \$50k \$50k \$30k \$30k

\$30k Median = \$50k Mode = \$30k
13. ### Measures of Central Tendency \$75k \$65k \$50k \$50k \$30k \$30k

\$30k Mean = \$47k Median = \$50k Mode = \$30k
14. ### Measures of Central Tendency \$75k \$65k \$50k \$50k \$30k \$30k

\$30k Mean = \$47k Median = \$50k Mode = \$30k \$500k \$75k \$65k \$50k \$50k \$30k \$30k \$30k Mean = \$104k Median = \$50k Mode = \$30k
15. ### Range: Difference between lowest and highest values Standard Deviation: Calculated

spread from the mean Interquartile Range: Spread from the median (Q3-Q1) Measures of Dispersion “Spread” of data; how far the data diverge from the data “center”
16. ### Levels of Measurement Nominal (aka Categorical) Ordinal Interval Ratio Descriptive

labels/ categories; no meaningful order to values Depict the order of a measurement, but not the difference between integers Depict the order and difference between integers (“interval” = distance between entities); No “true” zero Depict the order and difference between integers; “True” zero ✓ Mode ✓ Mode ✓ Median ✓ Interquartile range ✓ Mode ✓ Median ✓ Mean ✓ Interquartile range ✓ Standard deviation ✓ Mode ✓ Median ✓ Mean ✓ Interquartile range ✓ Standard deviation
17. ### Visualizing Data Strongly agree = 5 Agree = 4 Neither

agree nor disagree = 3 Disagree = 2 Strongly disagree = 1 Mean = 3.13 Mode = 5 Mean = 3.16 Mode = 3 Indicate your level of agreement that this is an overall effective course...

modes)
20. ### \$75k \$65k \$50k \$50k \$30k \$30k \$30k Mean = \$47k

Median = \$50k Mode = \$30k \$500k \$75k \$65k \$50k \$50k \$30k \$30k \$30k Mean = \$104k Median = \$50k Mode = \$30k
21. ### Examining Relationships Differences in measures of central tendency (means, medians,

modes) Crosstabs
22. ### Differences in satisfaction with city services based on race Using

frequencies Satisfied Neither Dissatisfied Total White 113 30 8 151 Nonwhite 37 15 22 74 Using percentages Satisfied Neither Dissatisfied Total White 75 20 5 100 Nonwhite 50 20 30 100
23. ### Examining Relationships Differences in measures of central tendency (means, medians,

modes) Crosstabs • Controlling for a third variable in crosstabs
24. ### Differences in satisfaction with city services based on race (percentages)

Satisfied Neither Dissatisfied Total White 75 20 5 100 Nonwhite 50 20 30 100
25. ### Differences in satisfaction with city services based on race (percentages)

Less- affluent neighborhoods Satisfied Neither Dissatisfied Total White 28 22 50 100 Nonwhite 31 18 51 100 More-affluent neighborhoods Satisfied Neither Dissatisfied Total White 77 18 5 100 Nonwhite 74 20 6 100
26. ### Examining Relationships Differences in measures of central tendency (means, medians,

modes) Crosstabs • Controlling for a third variable in crosstabs Measures of association • Appropriate correlation analysis for level of measurement (i.e. nominal, ordinal, interval); Johnson, pg. 208 • Direction of relationship • Strength of relationship (correlation coefficient = r); Johnson, pg. 206