Math 411: Feedback

Monday, November 19, 2012

Feedback

Carolyn & Sheena (Economic Materialism)

-great teaser introduction
-i liked the cost and production comparison between the cheap and expensive blue shirts
- most graphs were well balanced
- good use of referencing (site and date accessed)
- nice explanation of Canadian debt ratio
-look into average Cdn. debt per person (excluding mortgage) is $27,000
- slow down the slides with data so that clas can interpret
- careful with the language "meta-analysis" - know what it means if you are going to reference it or just paraphrase the slide
- good interpretation of data
- good interaction with audience and use of notes

Bill, Ryan, Michael (Aid Organization Truth)

- lost of good information
- take your time and try to focus more carefully on topic
- a little less background info (examples of corruption) will shorten presentation and clarify focal points
- tweak your choices on frequency tables (fewer choices or condense results) to improve graphs
- great slide transitions but when your audience "oohs and ahhs" more over the transition than the presentation, it's a sign.
- Careful with your notes, there was a fair bit of reading
- do your best to organize before you present. Rehearsals or practice walk through of presentation will help
- try not to cluster together when presenting, make sure you are all visible

Math 411

Monday, November 19, 2012

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Common types of graph
Graph type	Description	Used for
Line graph	Displays a series of dots connected by lines. When time is on the horizontal axis the plot is called a time-series graph. In such graphs the slope of the line between two points represents the rate of change in that variable over time	Line graphs are used to show patterns or trends in the measured variable (Y) as a result of changes in the size of the independent variable (X).
Scatterplot	(X,Y) points are plotted without a connecting line. A best fit line may or may not be fitted to the data	Used to display or assess the relationship between two variables
Vertical bar graph	Rectangular bars are plotted with vertical height of each bar representing the value of the measured (dependent) variable. Since X represents discrete data, there should be spaces between bars on the X axis. Generally preferred over horizontal bar graphs since the assignment of independent and dependent variables to the X and Y axes then match those used with line graphs.	Used to display the values of two or more different types / levels of the independent variable.
Horizontal bar graph	Similar to vertical bar charts except the categories of the independent variable are assigned to the Y axis and the value of each measured variable is represented as the horizontal length of the bar. Useful when category names are too long to fit at the base of column	Used to display the amounts / levels scores for different types independent variable.
Histogram	Looks similar to a vertical bar chart but Y axis data is always frequency. Also no spaces should be left between bars unless a category has zero frequency.	Used to display count (frequency, number of times something occurs) of data points falling within various ranges within a data set
Pie chart	Circular chart divided into segments (slices) with the size of each segment being proportional to the size (percent) of the quantity being represented within the overall sample. If values are not markedly different, differences may not be easy to decipher. Labeling pie segments with their actual values overcomes this problem.	Compares a small number of categories.