Phil is a participant in a study designed to examine the effects of taking a new protein-containing product on muscle tissue development. Phil suspects he's in the experimental group, because he's 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 didn't receive the new source of protein. Phil thinks the researchers made a mistake—he's certain his muscle mass increased while he consumed the product. According to this information, Phil's belief that his physical condition improved while he participated in the study is an example of

Placebo effect

Explanation:

Placebo effect is a phenomenon used during experiment,clinical trial or studies in which participant or some individuals experience a benefit after administration of an inactive substance. placebo effect is caused by the individual's expectation of the medication and which might cause thier body chemistry to cause similar effect to the real medication

1. seasonal

2. frictional unenployment

3. the number of the labor force multiplied by 100 and then subtract the number of unemployed.

4. 4%

5. an increase in prices

yes peace and development are complementary to each other since they both undergo a great deal of getting where they want to go whether its peace in general and. development