I am running a project on preterm and full term infants, and it's a comparative study on electrolytes, I need the formula and information on how to get not more than 30 as minimum sample size
I apologize for my previous response. I misunderstood your question.
To calculate the minimum sample size for a comparative study on electrolytes in preterm and full-term infants, you can use a formula that takes into consideration the effect size, level of significance, and power of the study. One commonly used formula for this purpose is:
n = (Zα/2 + Zβ)² * (SD1² + SD2²) / Δ²
where:
✓ n is the required sample size per group
✓ Zα/2 is the critical value of the standard normal distribution at level of significance α/2 (e.g., for α = 0.05, Zα/2 = 1.96)
✓ Zβ is the critical value of the standard normal distribution at power (e.g., for power = 0.8, Zβ = 0.84)
✓ SD1 and SD2 are the standard deviations of the two groups, respectively
✓ Δ is the effect size, defined as the difference in means between the two groups divided by the pooled standard deviation.
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