you can receive a free credit report from each reporting company once every 12 months you can also order your free credit report by phone call 877 322 8228 by mail download and complete the annual credit report request form and mail it to annual credit report request service p o box 105281
External validity refers to the extent to which the results of a study can be generalized to other settings (ecological validity), other people (population validity) and over time (historical validity). External validity can be improved by setting experiments in a more natural setting and using random sampling to select participants.
As far as validity is concerned, the term doesn't refer to the accuracy of a test (see A Misunderstood Grail in the September 2008 Educational Leadership). Rather, it refers to the accuracy of score-based inferences about test takers.