When adrian's computer would not respond to commands from the wireless keyboard, he tried restarting the computer, as that strategy had worked in the past. after several tries, the keyboard still did not work so he gave up and called a computer repair service. a technician easily solved the problem: the batteries in the wireless keyboard needed to be replaced. adrian's inability to solve the problem on his own had been hampered by his: ?

Penny poodle wanted to know which dog obedience training program was more effective: puppy pride, the approach she has been using for any years, or doggie do-right, a new approach. penny convinced 50 human companions of untrained dogs to participate in her study. the dogs and their humans were randomly assigned to complete the puppy pride or doggie do-right course. at the end of the training programs, all of the dogs were scored on their level of obedience on a standardized dog obedience checklist (scores could range from 10 to 100). the design of this study is: