In a cross-sectional study, a group of researchers wanted to estimate the prevalence of cephalosporin-resistant E.coli among adult males with urinary tract infections. From previous literature, the prevalence was found to be 6.5%. If the researchers want to estimate the prevalence with a 20% relative precision and 95% significance level, what is the minimum sample size required?
a) 1042
b) 1381
c) 6
d) 600
Answers
Answer:
d) 600
Explanation:
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Answer:
The correct answer for this question is option d) 600.
Explanation:
How do you determine a cross-sectional study's prevalence?
Under constant conditions, both the incidence and the length of the illness have an impact on the disease's prevalence (or survival with disease). Example: P1= a/a + b= 50/250 = 20.0 percent CHD prevalence in inactive people. P0 = c/c + d = 50/750 = 6.7 percent CHD prevalence among active individuals. The appropriate sample size for prevalence research would be determined using the straightforward calculation n = Z 2 P (1 - P) d 2 where n is the sample size, Z denotes the statistic corresponding to the degree of confidence, and P denotes the anticipated prevalence (which may be discovered through related studies or a pilot study).
Thus, a descriptive cross-sectional study measures the disease or condition, as well as any relevant contributing factors, for a defined population at a particular time.