For each example, state whether the one-sample, two-independent-sample, or related-samples t test is most appropriate. If it is a related-samples t test, indicate whether the test is a repeated-measures design or a matched-pairs design.

(a) A professor tests whether students sitting in the front row score higher on an exam than students sitting in the back row.

(b) A researcher matches right-handed and left-handed siblings to test whether right-handed siblings express greater emotional intelligence than left-handed siblings.

(c) A graduate student selects a sample of 25 participants to test whether the average time students attend to a task is greater than 30 minutes.

(d) A principal at a local school wants to know how much students gain from being in an honors class. He gives students in an honors English class a test prior to the school year and again at the end of the school year to measure how much students learned during the year.