If you perform a statistical analysis on the POP numbers for rows B, C, D, E, & G (using the averages and standard deviation values), you will find that they are the same with a 98% confidence interval whereas A & F are definitely different. I did that analysis a month ago as well, and found the same thing.
Although the POP numbers can vary from week to week, if enough sampling is done over a long period of time, the correct pattern should emerge, so I plan to continue that analysis in order to ascertain the pattern.
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