Which of the following will she be able to measure using the crest or trough of a single wave? a. the energy; it is only found in the crest or trough of a wave. b. the frequency; it is the distance between crests and troughs. c. the wavelength; it is measured by how fast the crest passes. d. the amplitude; it is measured by the center line of a wave to the crest or trough.

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: