Assume we are studying two groups. One group is scheduled on Wednesday morning and another on Wednesday afternoon. Participants are selected on availability. The confounding variable in this study is

Which one of the following is not one of the five elements that, according to Barry Buzan, combine to create a sense of national security?

a. Economic security b. Political security c. Cyber security d. Environmental security

Which of the following states refused to join the League of Nations after World War I?

a. the United States b. Germany c. Japan d. Italy