A market researcher plans to select a simple random sample of households from a population of 30,000 households to estimate the proportion of households with one or more videocassette recorders. The researcher asks a statistician what sample size to use and is told to use the formula
![](https://test.transtutors.com/qimg/88a54df0-0c1b-4aed-8acb-082d1c8bf558.png)
Describe exactly what the researcher needs to know or decide to fill in values for d, z, and p in the equation, and what will be accomplished by that choice of sample size.