Math
posted by Charlene .
will someone just double check my answers, please.
Identify which types of sampling is used:random,stratified, systematic,convenience.
1. a sample consists of every 20th student who leaves the bookstore.
answer:systematic
2. a pollster uses a computer to generate 500 random numbers, then interviews the voters corrosponding to those numbers.
Answer:stratified

Number 2 doesn't look like stratified to me: there's no stratification involved. Stratification is the process of grouping members of the population into relatively homogeneous subgroups before sampling, whereas here the pollster is simply picking voters at random, with each voter presumably ("presumably" because we don't know anything about the random number generator he's using) having an equal chance of being picked. That's simple random sampling.
Respond to this Question
Similar Questions

Math
How can you classify the 2 examples that you gave in part c? 
Government
1) The portion of the population selected to participate in a poll is known as the a. public b. population c. deliberative group d. sample e. focus group 2) A sample that does not overrepresent any portion of the population and whose … 
statistic
1.The state highway patrol stops every 5th car on highway 210 to check drivers' licenses and registrations. Which sampling technique are they using? 
algebra 1
Circle the most appropriate description. 27.A city planning commitee surveys 100 people waiting at a bus stop about the expansion of the public transportation system. Random Sample,systematic sample,selfselected sample, convenience … 
Algebra 1
Can you please check my work? A city planning committee surveys 100 people waiting at a bus stop about the expansion of the public transportation system. Is this an example of a: random sample, systematic sample, selfselected sample, 
Math (check answers)
1)Identify the sampling method. You want to determine the number of text messages students at your school send in a month. You go to the cafeteria and randomly ask students as they come out of the lunch line. A)Random*** B)Systematic … 
Urgent =Math
17. Tell whether this survey describes a good sample and if so, name the method of sampling used. Every sixth person leaving a restaurant is surveyed to determine their favorite food from the menu. yes, random******** yes, systematic … 
Urgent =Math
Tell whether this survey describes a good sample and if so, name the method of sampling used. A phone company randomly calls 6 names from the phone book to find whether the person is satisfied with the phone service. yes, random yes, … 
Algebra 1
A city planning committee surveys 100 people waiting at a bus stop about the expansion of the public transportation system. Is this an example of a: random sample, systematic sample, selfselected sample, convenience sample, bipartisan … 
Social Research Methods
Sampling. Use ONE page of your community’s telephone book to complete the following: Build a sample using SRS (N=10). Build a sample using Stratified SRS, stratified by gender (N=20). Build a sample using systematic sampling (N=20). …