A screenting study is performed to determine the prevalence of colon cancer in 1

Question

A screenting study is performed to determine the prevalence of colon cancer in 10000 subjects in a rural community. Researchers are examining the efficacy between a fecal occult blood stool sampling and a colonoscopy. The two tailed test with a p value of 0.025 and a 95% confidence interval indicates that the colonoscopy screening provides a higher rate of early detection. Researchers have found that allowing the participant to select the screening test did not affect the findings compared to previous results.Which limitation of this study reduces the credibility of the report? 1) Casality is determined by the screening method in this study. 2) The respondent bias affects this cross-sectional study. 3) Data collection on a large sample size is difficual. 4) Confounders are difficult to control in this study. (Please explain the answer in detail- Thanks)

Explanation / Answer

3.The data collection of a large sample size is difficult

Since the sample under study is vary large ,10000, collection and handling of data of this size is difficult which reduces the credibility of the report

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