SOLVED

11)In a study using the multilevel, completely-randomized between-subjects design, 48 rats were randomly assigned to six groups of eight rats each. Each group was tested at a different level of ambient noise. Maze running speed and accuracy were measured. The independent variable in this study was A)the number of rats. B)speed. C)accuracy. D)ambient noise level. 12)In a study using the multilevel, completely-randomized between-subjects design, 48 rats were randomly assigned to six groups of eight rats each. Each group was tested at a different level of ambient noise. Maze running speed and accuracy were measured. A dependent variable in this study was A)the number of rats. B)speed. C)ambient noise level. D)the number of rats per group. 13)In the multilevel, completely-randomized, between-subjects design, participants are A)randomly assigned to three or more conditions. B)randomly assigned to two conditions. C)always tested on a pretest measure. D)always assigned to groups with equal numbers of participants. 14)In order to test the effects of room temperature on worker productivity, 48 typists were randomly assigned to six groups of eight typists each, and each group was tested at a different room temperature (the independent variable) using dependent measures of typing speed and accuracy. What type of design does this study represent? A)An ex post facto design. B)A Solomon four-group design. C)A multilevel, completely-randomized, between-subjects design. D)A multilevel, randomized within-subjects design. 15)The Solomon four-group design was developed in an attempt to A)control possible interaction effects of the pretest and the manipulation. B)allow more levels of the independent variable. C)allow more groups to be tested at the same time. D)control possible interaction effects of the pretest and posttest measures. 16)The Solomon four-group design combines the A)randomized, pretest-posttest, control-group design and the randomized, posttest-only, control-group design. B)randomized, pretest-posttest, control-group design with the multilevel, completely-randomized, between-subjects design. C)multilevel, completely-randomized, between-subjects design with the posttest-only, control-group design. D)experimental with non-experimental designs. 17)A disadvantage of using the Solomon four-group design is that A)it is not useful in situations in which an interaction is suspected. B)it requires the resources of two experiments. C)the data are difficult to analyze and interpret. D)it is only useful in preliminary testing of basic hypotheses. 18)A Solomon’s four-group design is used mostly A)when there is an expected iteraction between the pre-test and the treatment. B)in exploratory research. C)when there is an expected interaction between the particpants and the researcher. D)as a means of testing new hypotheses. Â