chp 4 exercises fixed

OpenIntroStat · Feb 28, 2024 · e9381a5 · e9381a5
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diff --git a/_freeze/04-explore-categorical/execute-results/html.json b/_freeze/04-explore-categorical/execute-results/html.json
diff --git a/exercises/_04-ex-explore-categorical.qmd b/exercises/_04-ex-explore-categorical.qmd
@@ -293,7 +293,7 @@
     c.  How can you investigate the relationship between meat consumption and life expectancy in the presence of confounding variables (like income)?
 
 8.  **Florence Nightingale.** Florence Nightingale was a nurse in the Crimean War and an early statistician.
-    In her notes, she opined "In comparing the deaths of one hospital with those of another, any statistics are justly considered absolutely valueless which do not give the ages, the sexes, and the diseases of all the cases." [@nightingale:1859]
+    In her notes, she opined, "In comparing the deaths of one hospital with those of another, any statistics are justly considered absolutely valueless which do not give the ages, the sexes, and the diseases of all the cases." [@nightingale:1859]
 
     a.  Nightingale describes three confounding variables to consider when comparing death rates across hospitals.
         What are they?
@@ -302,11 +302,11 @@
     b.  Provide two additional potential confounding variables for this situation.
         Check to make sure that the variables are associated with both the explanatory variable (hospital) and the response variable (death).
 
-    c.  Why does Nightingale say that the statistics are "valueless" if given without being broken down by age, sex and disease?
+    c.  Why does Nightingale say that the statistics are "valueless" if given without being broken down by age, sex, and disease?
         Explain.
 
-9.  **On-time arrivals.** Consider all of the flights out of New York City in 2013 that flew into San Francisco (SFO), Los Angeles (LAX), or Puerto Rico (BQN) on the following two airlines: JetBlue (B6) or United Airlines (UA).
-    Below are the tabulated counts for the number of flights `on time` and `delayed` for each airline into each city.[^_04-ex-explore-categorical-4]
+9.  **On-time arrivals.** Consider all of the flights out of New York City in 2013 that flew into Puerto Rico (BQN), Los Angeles (LAX), or San Francisco (SFO) on the following two airlines: JetBlue (B6) or United Airlines (UA).
+    Below are the tabulated counts for the number of flights `delayed` and `on time` for each airline into each city.[^_04-ex-explore-categorical-4]
 
     ```{r}
     flights |>