Dr Allport Wants to Establish Test-Retest Reliability for a New

Dr. Allport wants to establish test-retest reliability for a new measurement tool on personality. Which of the following is true?

A) Dr. Allport should use a group of people similar to his target population to test the instrument
B) Dr. Allport should split the participants into two groups. He gives the test to one group, waits two weeks, and gives the test to the second group
C) An r of .55 is acceptable for a personality measurement tool
D) Dr. Allport should divide the high item pool in half and give these two different measures to the same people a week apart
E) None of the above