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**Answer:**

**Option C is true. To calculate a sample proportion, we need to know the population size. **

**Step-by-step explanation:**

**To calculate a sample proportion, we need to know the population size. – This is the true statement.**

A sample statistic can never be equal to the population parameter. This is false. A statistic is a feature of sample and a parameter is a feature of population. Every sample of the selected size has an equal chance of being used.

Point estimates are defined for both samples and populations. This is false. A point estimate is used to estimate the population parameter.

To calculate a point estimate, we need to know the sample size. This is false. Population is needed.

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