The next step in our statistics unit is to think about how we sample from a population. For this I am going to supply you with a database of the top 100 grossing (that means $$$) films of two years 2012 and 2013.
The key learning is...[the words in red are words that are vital to know/use]
- We often have too many numbers to deal with - so we pick a smaller sample from the population. This is called sampling.
- Sampling can easily cause bias (remember b.s.) so we have to be fair in picking. We can be fair by choosing randomly.
- We still look to 'clean' any data - is there clearly an error in there. FYI there isn't in this database I've given you.
- We are still focussed on the PPDAC inquiry cycle.
Here is a copy of the list that of the top 100 for each year (it goes on two pages). I've put them into alphabetical order. The numbers I've rounded to the nearest one hundred million dollars to put the value of these in perspective the entire NZ economy for 2013 was worth US$180 million dollars so that means a movie like Ice Age : Continental Drift was worth nearly as much as the entire NZ economy!.
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