Question

select the correct answer. which statement is true? a. a sample statistic can never be equal to the population parameter. b. point estimates are defined for both samples and populations. c. to calculate a sample proportion, we need to know the population size. d. to calculate a point estimate, we need to know the sample size.

Explanation:

• Option A: A sample statistic can be equal to the population parameter by chance, so this is false.
• Option B: Point - estimates are for samples, not populations. Population values are parameters, not point - estimates, so this is false.
• Option C: To calculate a sample proportion, we only need to know the number of successes in the sample and the sample size, not the population size, so this is false.
• Option D: Point estimates (e.g., sample mean, sample proportion) are calculated using sample data, and sample size is a key part of the calculation, so this is true.

Answer:

D. To calculate a point estimate, we need to know the sample size.