A researcher believes there is risk between the strain of human papillomavirus (HPV) infection and the risk

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A researcher believes there is risk between the strain of human papillomavirus (HPV) infection and the risk of cervical cell abnormalities.

In the population, 30% of cervical biopsies are negative, 40% are CIN I, 20% are CIN II, 5% are CIN III, and 5% are CIS. A random selection of hospitals is made, and a random selection of biopsy results is
reviewed. What type of sample is this?

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