A drug company wanted to test a new depression medication. The researchers found 500 adults aged 25-35 and randomly assigned them to two groups. The first group received the new drug, while the second received a placebo.
After one month of treatment, the percentage of each group whose depression symptoms decreased was recorded and compared. Identify the experimental units. A) the 500 adults aged 25-35
B) the percentage who had decreased depression symptoms
C) the drug (medication or placebo)
D) the one month treatment time
Question 2
According to government data, the probability that an adult was never in a museum is 10. In a random survey of 20 adults, what is the mean and standard deviation of the number that were never in a museum?
A) mean: 2; standard deviation: 1.34164079 B) mean: 18 standard deviation: 1.41421356
C) mean: 18; standard deviation: 1.34164079 D) mean: 2; standard deviation: 1.41421356
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