Check warnings in examples

[codecov[bot]]

Codecov Report

Merging #216 (626d93d) into main (95c1d7d) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #216   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          502       501    -1     
=========================================
- Hits           502       501    -1     

Impacted Files	Coverage Δ
R/contingency_table.R	100.00% <ø> (ø)
R/meta_analysis.R	100.00% <100.00%> (ø)
R/one_sample_test.R	100.00% <100.00%> (ø)

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