Systematic random sampling. Systematic random sampling is done through some ordered criteria by choosing elements from a randomly arranged sampling frame. You can chose from every ânthâ element in a sample frame i.e. 10th, 15th, 20th and so on.
An associate or bachelor's degree is typically required to pursue employment as a diagnostic medical sonographer. Students also have the option to graduate with a degree in a related field, pursue a certificate program in diagnostic medical sonography and then receive on-the-job training.earn how to become a diagnostic medical sonographer. Research the job description, education and licensing requirements to find out how to start a career in medical sonography.
Certification Requirements. Licensure by the state is not a requirement for medical sonographers. Credentials are available from the American Registry for Diagnostic Medical Sonography (ARDMS). To earn registration, an examination must be passed.Those who pass the test may call themselves a Registered Diagnostic Medical Sonographer (RDMS). medical sonographer may enter the field through on-the-job training in a sonography practice that has been accredited by AIUM (American Institution of Ultrasound in Medicine, www.aium.org).