psychology

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Suppose that you have developed three new kinds
of hair shampoo, and you want to know how people's preference depends on their
age. Design an experiment to find out.

  • psychology -

    You might have people randomly assigned to the three shampoos and block by age.

    Shampoo A B C

    age group 1

    age group 2

    age group 3

    Give each age group shampoos A, B, C. have them use each shampoo for a week and then rate them.

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