A survey of a random sample of 320 pet owners undertaken by Patrocka Petfoods yielded the following data about type of pet and size of household:
![1635_8f111c16-4a81-402b-9152-03b5a52b302a.png](https://secure.tutorsglobe.com/CMSImages/1635_8f111c16-4a81-402b-9152-03b5a52b302a.png)
(a) Using a 1% level of significance test for association between type of pet and type of household.
(b) Examine the components of the test statistic and comment on the patterns they reveal.