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exam1 core question 10

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Odette:

--- Quote from: "AhaShake" ---it cant be scatter plot
here is a quick one i whipped up proving the impossibility of scatter plot being the correct answer.

(Image removed from quote.)

that doesnt tell us much at all does it?
--- End quote ---


How do you know it will turn out like that?

AhaShake:
well i think it is reasonably fair to assume that there will be atleast one in each salary catagory with a small, medium or large car. if not, say take out large and low salary. it still doesnt actually tell us anything meaningful, just that yes there are medium salary earners with a medium sized car. how many? what percent? scatter plot just wouldnt work.

Lyonzy:
Has anybody been told about ordinal categories? It isn't on the study design, but i heard it at a TSFX lecture. They are basically categories which have an order to them, like first, second or third. I think that the variables in q10 are categorical ordinal, and therefore best displayed in a percentaged segmented bar chart. If salary was measured in dollars and car size in cubic metres then i would say a scatterplot, but since there's only three of them then its probably unlikely to show a relationship (imo).

hifer:

--- Quote from: "Lyonzy" ---Has anybody been told about ordinal categories? It isn't on the study design, but i heard it at a TSFX lecture. They are basically categories which have an order to them, like first, second or third. I think that the variables in q10 are categorical ordinal, and therefore best displayed in a percentaged segmented bar chart. If salary was measured in dollars and car size in cubic metres then i would say a scatterplot, but since there's only three of them then its probably unlikely to show a relationship (imo).
--- End quote ---


Ya, the TSFX lecture notes tell us that 2 categorical variables such as in this question should be plotted with a Segmented bar chart. They are not numerical variables and thus a scatter plot can't be used.

maxleng:

--- Quote from: "AhaShake" ---

(Image removed from quote.)

cha ching we have a winner
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awsome work there..

it is clear that there are 2 CATEGORICAL VARIABLES and that is best displayed by segmented bar charts.

i think some people are thinking into it abit too much, i really strugle to see how it can be a scatterplot

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