When determining the sample size (n)for a confidence interval for ρ,if past experience tells us that p is at least 0.8,use p = .2.

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The statement is incorrect. If past experience tells us that p is at least 0.8, then we should use this value for p instead of using p = 0.2. The sample size calculation is highly dependent on the estimated value of p, so using an incorrect value can result in an unreliable confidence interval.

When Determining the Sample Size (N)for a Confidence Interval for ρ,If