Question: The same poll as in Exercise has asked about social networking over several years and for different age groups. Here is a table of responses:

The same poll as in Exercise has asked about social networking over several years and for different age groups.

Here is a table of responses:

a) Under the usual null hypothesis, what are the expected values?
b) Compute the x2 statistic.
c) How many degrees of freedom does it have?
d) What do you conclude?

18-29 30-49 50-64 Total May-2010 Aug-2011 Aug-2012 Total 843 1075 843 995 2761 273 325 259 857 277 362 270 909 293 388 314

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