A public library wants to determine the research needs of children and adults who access the reference section. You will use stratified sampling.
a. Define the population.
b. Define the sample frame.
c. Explain how you would select the sample.
d. Explain how you would gather the data.
Full Answer Section
- Selecting the Sample:
We will use stratified random sampling to ensure the sample reflects the proportions of children and adults who use the reference section. Here's how:
- Stratify the Population: Divide the population into two strata based on age: children (defined by the library's age limit for children's services) and adults.
- Determine Proportions: Analyze library usage data (e.g., entrance records or borrowing data) to determine the percentage of children and adults who typically use the reference section.
- Allocate Sample Size: Decide on the total desired sample size (e.g., 100 participants). Based on the proportions from step 2, allocate a specific number of participants to each stratum (e.g., 60 adults and 40 children).
- Random Sampling Within Strata: Independently select a random sample of the desired size from each stratum. This can be done using library user IDs or other identifiers.
- Gathering Data:
There are two main approaches to gather data:
- Surveys: Design separate surveys for children and adults that address their research needs and preferences when using the library's reference section. The surveys can be paper-based or online, distributed at the reference desk or through email invitations to patrons who have used the reference section recently.
- Observation: Librarians or trained observers can anonymously observe patrons using the reference section. This can provide insights into the types of research tasks undertaken, resources used, and any challenges encountered.
By combining these methods, the library can gain a comprehensive understanding of the research needs of both children and adults who utilize the reference section.
Sample Answer
Stratified Sampling for Public Library Research Needs Assessment
a. Population:
The population for this study is all patrons who access the reference section of the public library. This includes both children and adults.
b. Sample Frame:
The sample frame is a list of all library patrons who have used the reference section in a specific period (e.g., past month). This list could be compiled from library entrance records or borrowing records for reference materials.