Mathematics, 20.08.2019 15:30 DeGeneral770

Rylan is testing 2 different types of nail polish on her fingernails to determine which one lasts longer. she purchases brand a and brand b from the drug store. she then paints her nails with brand a and her sister's nails with brand b. she compares the nails polish at the end of the week and determines that brand b last longer because there fewer chips than brand a. why is her conclusion not valid?

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