Astudy is created in which the participants were randomly assigned to groups for different treatments. which best describes the reason this was done?
a.
it allows us to use chance as a way to create groups that are similar to the population.
b.
it allows us to determine if the treatment effect is significantly different from the placebo effect.
c.
it allows us to see the true nature of any effects of different treatments.
d.
it allows us to distinguish among the effects of different factors.

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step-by-step explanation:

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step-by-step explanation:

total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98