Which of the following kinds of studies would be the best to use when investigating whether cigarette smoking influences weight gain?  

Jerry’s height is 70 inches. What is his approximate height in centimeters?

Jerry’s height is 70 inches. What is his approximate height in centimeters?

Which of the following groups of foods is not a major food group of MyPlate?

Which of the following groups of foods is not a major food group of MyPlate?

A nutrition scientist has heard anecdotes about the usefulness of taking megadoses of vitamin C to prevent the common cold. The researcher decides to test the hypothesis that consuming such large doses of vitamin C are an effective way to prevent colds. He provides dietary supplements that contain 10 times the physiological dose of vitamin C in each pill to a group of 12 adults, and he instructs the people to take one pill daily for a year. After a year, the scientist asks the subjects to recall the number and duration of colds they experienced during the previous 12 months. After collecting and analyzing the subjects’ responses, the researcher determines that taking megadoses of vitamin C each day is an effective way to prevent cold infections. Based on this information, which of the following statements is true?

A nutrition scientist has heard anecdotes about the usefulness of taking megadoses of vitamin C to prevent the common cold. The researcher decides to test the hypothesis that consuming such large doses of vitamin C are an effective way to prevent colds. He provides dietary supplements that contain 10 times the physiological dose of vitamin C in each pill to a group of 12 adults, and he instructs the people to take one pill daily for a year. After a year, the scientist asks the subjects to recall the number and duration of colds they experienced during the previous 12 months. After collecting and analyzing the subjects’ responses, the researcher determines that taking megadoses of vitamin C each day is an effective way to prevent cold infections. Based on this information, which of the following statements is true?

Which of the following observations is an example of an inverse correlation?

Phil is a participant in a study designed to examine the effects of taking a dietary supplement on muscle tissue development. Phil suspects he is in the experimental group, because he is certain his muscles are bigger and stronger as a result of taking the product supplied by the researchers. When the study is completed, Phil learns that he did not receive the dietary supplement. Phil thinks the researchers made a mistake—he is certain his muscle mass increased while he took the supplement. According to this information, Phil’s belief that his physical condition improved while he participated in the study is an example of 

The body eliminates excess water through the