medical researchers

2. You have formulated a hypothesis: “Apples contain more vitamin C than oranges.”

To test your hypothesis you measure vitamin C levels in 20 oranges and 20 apples from trees that were grown in the same orchard under the same environmental conditions (temperature, rain, sunlight). This experiment was conducted twice. The control group in the experiment is

A) type of soil, temperature, amount of rain and sunlight in the orchard

B) vitamin C levels

C) oranges

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D) apples

E) a large sample size and repeated experiment

***Use the following information to answer questions 3, 4, 5 & 6 below***:

A group of medical researchers investigated the effects of Drug X on lowering cholesterol levels in a group of men between the ages of 50 and 70 years old. The researchers did the following experiment and obtained the indicated results: One group of 150 men took a tablet containing Drug X for 3 weeks – 95 of these men decreased their cholesterol levels by at least 10% (three men from this group dropped out of the study). Another group of 150 men was given a tablet with no added Drug X for 3 weeks – 10 of these men decreased their cholesterol levels by at least 10% (two men from this group dropped out of the study).