Which of the following statements is true about stratified random sampling?
a. Allows the researcher to use a smaller sample size
b. Ensures obtaining a larger sample at lower cost
c. Internal validity is strengthened with this type of sampling
d. Involves the selection of certain subjects from a convenience sample
ANS: A
With stratification, the researcher can use a smaller sample size and achieve the same degree of representativeness in relation to the stratified variable as a large sample acquired through simple random sampling.
There is no assurance of a larger sample.
Internal validity is not necessarily strengthened with stratified random sampling over random sampling.
Subjects are still selected through a probability process.
You might also like to view...
According to the DSM-IV-TR Axis guidelines, clinical disorders are described as:
a. Dependent, antisocial personality disorders, and levels of retardation b. Educational, housing, legal, and economic problems c. Heart and digestive disorders d. Mood disorder, substance abuse, and schizophrenic disorders
Which adverse effects may the patient commonly experience if taking the drug nilutamide? Se-lect all that apply
a. Hot flashes b. Impotence c. Nausea d. Diarrhea e. Hypertension f. Hyperglycemia
A child with acute renal failure will have the diagnosis reclassified to chronic renal failure then which of the following conditions is met?
a. There is renal scarring, and the condition is not responding to vigorous treatment for 2 weeks. b. About 50% of the renal function remains, and the condition has lasted several months or more. c. The condition has not responded to three courses of medication. d. There is no commonly used set of conditions, and this is a medical judgment.
The nurse is preparing a smoking cessation class for family members of patients with lung cancer. The nurse believes that the class will convert many smokers to nonsmokers once they realize the benefits of not smoking
Which health care model is the nurse following? a. Health belief model b. Holistic health model c. Health promotion model d. Maslow's hierarchy of needs