Question

a researcher wants to develop a product for families who have small children. he needs to determine if there is a nationwide interest in a toy that will help children describe their emotions. he asks only a sample of the population to complete his survey. what should be true of the sample so that the results of the survey can be used to predict the results of surveying the population?
the size of the sample should be the same size as the population.
the families included in the sample should represent the families in the population.
the families included in the sample cannot be included in the population.
the size of the sample should be larger than the size of the population.

Explanation:

For survey results to be used to predict population - level results, the sample must be representative of the population. A sample that is representative reflects the characteristics of the entire population. A sample size equal to the population is not a sample but a census. Samples are subsets of the population, so they cannot be larger than the population, and they must be included in the population.

Answer:

The families included in the sample should represent the families in the population.