Author Question: A drug company wanted to test a new acne medication. The researchers found 300 adults aged and ... (Read 196 times)

WWatsford · **on:** Jul 25, 2018

A drug company wanted to test a new acne medication. The researchers found 300 adults aged 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 acne symptoms decreased was recorded and compared. Identify the experimental units.
A) the drug (medication or placebo)
B) the 300 adults aged 25-35
C) the percentage who had decreased acne symptoms
D) the one month treatment time

Question 2

A 1-pound bag of peanuts contained 430 peanuts. The distribution of weights (in grams) of the peanuts is given below . What is the sample standard deviation of the weight of a peanut?

Weights
(grams) Frequency

0.755 - 0.814 3
0.815 - 0.874 2
0.875 - 0.934 2
0.935 - 0.994 2
0.995 - 1.054 168
1.055 - 1.114 241
1.115 - 1.174 12

A) 0.002 g B) 0.000004 g C) 0.045 g D) 0.209 g