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?
Because she and her sister may have done different activities which would have possibly damaged the nail polish differently
Answer:
b
Step-by-step explanation:
She painted her sister's nails with Brand B, not her own nails.