Update _18-ex-inference-tables.qmd

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exercises/_18-ex-inference-tables.qmd

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 10. **Disaggregating Asian American tobacco use, smaller data.** Understanding cultural differences in tobacco use across different demographic groups can lead to improved health care education and treatment.
-    A recent study disaggregated tobacco use across Asian American ethnic groups [@Rao:2021].
+    A recent study disaggregated tobacco use across Asian American ethnic groups. [@Rao:2021]
 
     Consider the situation where the dataset is 50 times *smaller* than the original data (but have the same proportional representation in each category).
     The distribution of smokers in each of the ethnicity groups in the smaller data are as follows.