... the A-Z map of Mapton Bridge. This might not work very well because the street may not have any Houses. For example one street might be in an industrial estate. I need to have streets in different parts of the town to covert he difference across the town. If I do not get enough houses, or all the streets are in part of Mepton Bridge, I might need to extend my sample by picking some more streets. I will work out the mean, the median, the mode and the range for each street so that I can compare the streets. This will help decide whether my sample is biased in any way, because I want it to be typical of the towns as a whole. I will also work out the same information for all houses together to get estimates for the whole town. I will use the estimate for the ...

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