Guys - I'm away again today and tomorrow with some deputy principal jobs that I've got to have done. I'm a bit worried about where you're at with your projects - this post is hopefully going to have you back on track...
PPDAC
A for Analysis... this is where you need to be processing your 30 numbers for the Holdens and 30 numbers for the Fords. The main things that I need for you to have done are...
Stem and Leaf Graphs for the numbers... e.g. this graph shows some car odometers (how many kms travelled). You can see that we're talking about 1000's of km. So the top car has 159,000km on the 'clock' and there are three cars that have all travelled 190,000's of distance.[I would recommend rounding of big numbers to the nearest 1000]
The next calculations that you will need will be the measures of the middle.
Mean = total/number = (159 + 162 + 168 + 173 ... + 193) / 15 = ???
Median = very middle number = 180,000km
Mode = most common (in my stem n leaf graph there is one mode) = 173,000
The next calculation is the spread
Range = highest - lowest = 193 - 159 = 34,000km
Then you need to find the upper and lower quartiles.
note - this is worthy of your time - it is the most technical part of the PPDAC cycle. You can find extra support examples of this further down these posts.
The Graph(s)
You can do some histograms (bar graphs with no gaps)...
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