In a(n) _____, one or more variables are identified and ...

[tiffannnnyyyyyy]

In a(n) _____, one or more variables are identified and controlled or manipulated so that data can be obtained about how they influence the variable of interest identified first.
 a. experimental study
  b. observational study
  c. categorical study
  d. variable study

Question 2

What is a dummy variable, and how is it useful to multiple regression? Give an example of three dummy variables that could be used in describing your home town.

[SomethingSomething]

Answer to Question 1

A

Answer to Question 2

A dummy variable is a variable that takes on a value of one or zero to indicate the presence or absence of an attribute. Dummy variables can help explain some of the variation in y due to the presence or absence of a characteristic. Three dummy variables that can be used to describe one town versus another are URBAN (1 if urban, 0 otherwise), MANUF (1 if durable goods manufacturing is the major industry, 0 otherwise), and POPMIL (1 if the population is 1 million or more, 0 otherwise). Other dummy variables could include the presence of a major university, a major medical center, a major research institution, and many more.

[tiffannnnyyyyyy]

Gracias!

[AmberC1996]

Excellent