The Proportion of People Who Wear a Face Mask in a Dutch Indoor Shopping Mall

Summary In the popular indoor mall “Hilvertshof”, in the Dutch town of Hilversum, on Monday October 12th, 2020, at about 3 pm, I counted 175 adults wearing a face mask, and 261 adults not wearing a face mask, for a mask wearing percentage of about 40%. Based on this data collection experience, I also offer four conjectures that future research…
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