After reading the paragraph, answer the question(s) that follow.
The National Institutes of Health (NIH) set up a study to determine whether large doses of vitamin C would shorten the length of time it takes to recover from a cold. Three thousand volunteers were split into two groups. For two weeks, members of Group A took 3,000 mg of vitamin C daily. Group B received 3,000 mg of a placebo. At the end of the two-week period, the researchers inserted live cold viruses directly into the noses of all the volunteers. The volunteers in both Group A and B continued to take their daily pills. All the volunteers got colds, and there was no significant difference in the length of time the colds lasted.
1) Which was the experimental group?
A) Group A only
B) Group B only
C) all 3,000 volunteers
D) the researchers that inserted the cold virus
2) To have confidence that the results of the experiment were valid, you'd also want to know A) whether any volunteers had colds at the start of the experiment. B) whether the volunteers exercised daily.
C) whether the volunteers all worked for the same company.
D) what the volunteers ate during the experiment.
You've been experiencing acid indigestion lately, and you'd like a quick fix for the problem. You do a little research on the Internet and discover that your problem is caused by excess stomach acid. In the pharmacy aisles, however, you're having a little trouble deciding what to purchase to address the problem. At the pharmacy counter, the clerk recommends that you purchase Pepcid-AC® or Alka-Seltzer® tablets.
1) If you could check the pH of...