A survey was undertaken to estimatethe hours worked per week by volunteers in a social service agency.The agency provides telephone support 7 days a week for 12 hourseach day.

There are currently 12,478 volunteersacross the country. This number is the number recorded in thevolunteer register on 1 May 2018. 100 of these volunteers wererandomly chosen. The 100 were each sent an email and asked torecord the total hours they worked for the week starting on Monday7^th May.

In this sample survey, what is thetarget population that is being sampled? What is the size of thepopulation that is being sampled?

What is the sample unit in this survey? What is the size of thesample?

What is meant by the words “sampleframe”? Use this study’s sample frame to explain your answer.

Describe in this study how the sampleframe could by mistake include population units that are not in thetarget population.

Describe in this study how the sampleframe could by mistake exclude population units that are in thetarget population.

Describe how you would randomly select the 100 volunteers forthe survey.

What measurement are you taking from each sample unit?

What is the sample estimator in this survey?

Write down four examples of possible non-sampling errors in thissurvey.

If you were to improve the survey byusing stratified random sampling, how would you create separatestrata for this population (i.e. what information would you use tostratify the target population)?

Describe what stratified randomsampling is and how in this situation it could improve the surveyby reducing the variance of the sample estimator.