question 15 (1 point) saved the manager of a ...
question 15 (1 point) saved the manager of a public swimming pool wants to compare the effectiveness of 2 laundry detergents a and b used on their towels. as each dirty towel is turned in, it is placed into the only washing machine on the premises. once 20 towels are in the machine, the manager flips a coin to determine whether detergent a or b will be used. the cleanliness is rated by a person who does not know which detergent was used. which of the following best describes the manager’s study? a completely randomized design an observational study a randomized block design with det. a and det. b as blocks. a matched - pairs design with det. a and det. b as the pair a randomized block design with the washing machine as the block.
Answer
# Brief Explanations:
The manager flips a coin to randomly assign one of two detergents (A or B) to each batch of 20 towels. This is a completely randomized design as treatments (detergents) are randomly assigned to experimental units (towels in batches). It's not an observational study since an intervention (detergent use) is being applied. It's not a randomized - block design with detergents as blocks because blocks are usually homogeneous groups and here the random assignment is the key. It's not a matched - pairs design as there is no pairing of individual units. Also, the washing machine is not a block.
# Answer:
A. A completely randomized design