Dr. Bermerge must design a survey of a national sample. The survey must include many questions, some of them complex with multiple branches and some of them of little interest to respondents. The questions do not tend to deal with personal or intimate matters. What would be the most advantageous survey design for achieving these goals?

Dr. redbull conducts a study to determine whether her new energy drink children perform better on spelling tests. she randomly assigns children to one of two groups: group 1 receives her energy drink and group 2 receives water. she then gives both groups a spelling test and compares the results. which of the following is true about this study? a. group 1 is the dependent variable and group 2 is the independent variable. b. this is a correlational study. c. group 2 is the experimental group. d. the independent variable is the type of drink the children receive.