Answer:
True
Step-by-step explanation:
When dealing with confidence intervals for the population mean, the formula is;
x¯ - z_α(σ/√n) ≤ μ ≤ x¯ + z_α(σ/√n)
Where;
μ is population mean
x¯ is sample mean
z_α is z-value of confidence interval
σ is population standard deviation.
n is sample size
From the formula, we can see that when we rearrange it to make the sample size the subject, it is clear that we need to know the value of the sample mean x¯ in order for us to solve for the sample size
