Part 1

Frankfort-Nachmias and Leon-Guerrero (2018) noted that the precision of a confidence interval can be enhanced by increasing the sample size. 

Write a 250- to 300-word response to the following:

·        How does sample size affect the validity of a study?

·        What factors determine the size of an ideal sample?

·        How is the sample size calculated?

Reference: Frankfort-Nachmias, C., & Leon-Guerrero, A. (2018). Social statistics for a diverse society (8th ed.). Thousand Oaks, CA: SAGE Publications, Inc. 

Part 2

Write a 250- to 300-word response to the following:

·        Select one of the sampling designs introduced in this week’s readings. Probability sampling

·        Give a brief introduction of the sampling design, and explain where you might apply it most successfully.

Use APA guidelines, in text citations and a reference page