statistics
posted by jane .
3 PROFESSORS WANT TO KNOW IF HAVING 500 STUDENTS IN THEIR CLASS IS DETRIMENTAL TO PROPER LEARNING. 1ST PROFFESSOR RANDOMLY HANDS OUT THE QUESTIONNAIRE TO 50 STUDENTS; ALL 50 ARE RETURNED TO HIM DURING CLASS. 2ND PROFFESSOR HANDS OUT THE QUESTIONNAIRE TO ALL 500 STUDENTS AND ONLY 100 RETURN THEM AT THE END OF CLASS. 3RD PROFESSOR REFEERS HIS 500 STUDENTS TO A WEBSITE FOR THE QUESTIONNAIRE AND 100 OF THEM RESPOND. WHICH PROFESSOR HAD THE BEST WAY OF DOING HIS SURVEY? WHICH ONE WAS THE WORST?

Thank you for using the Jiskha Homework Help Forum. In the future, please do not use CAPITAL letters as it is considered impolite (like shouting) and is harder to read.
Did the first professor only have 50 in the class? If so, he may have wasted class time filling out the questionnaire, but he got 100% results. If the 2nd has 500 students in a class, it's a wonder anyone learns anything! He only had 20% response. The 3rd professor wasted no time in class but who knows how many will even go to the Website. 
The first one who hands out survey randomly to 50 of the 500 students is the best. There will be minimal bias.
The website survey is the worst, because it will be biased by those who chose to respond and those who have computers available. This is why political surveys are no longer done by telephone.
Of the 100 of 500 who returned the handedout questionnaire, there may be some bias within the group responding. Previously, some surveys that were not done randomly concluded that their population was very polarized — either extremely pro or extremely con — in terms of the topic. However, they did not realize that those in the middle — who did not care one way or the other or did not have strong feelings about the topic — would be very unlikely to fill out and return the questionnaire.
I hope this helps a little more. Thanks for asking.
Respond to this Question
Similar Questions

AE.. does it sound ok
Constructivism Constructivism is an educational theory that emphasizes handson, activitybased teaching and learning during which students develop their own frames of thought. Classroom Management I would begin each class period with … 
statistics: dependent event
A psychology class is comprised of 4 female and 6 male students. If the instructor of the class randomly chooses 6 students from the class for an oral exam, what is the probability that 2 female students and 4 male students will be … 
English
1) Four American 17yearold students will be in class with us tomorrow for an hour. 2) I need to prepare some activities to entertain them. They can't speak any Italian so the activities must be English. 3) I was thinking of preparing … 
MAth
14 students in an Algebra class were asked to shake hands with each other. Each student shook hands with each of the other students exactly once. How many handshakes occured in this class? 
8th grade math
A group of 1,500 high school students were asked to fill out a questionnaire about their future career choices. The circle graph represents the results of the questionnaire. Use the circle graph to answer the question. Doctor: 20% … 
Psychological Statistics
A researcher predicts that watching a film on institutionalization will change studentsâ€™ attitudes about chronically mentally ill patients. The researcher randomly selects a class of 36 students, shows them the film, and gives them … 
Math
There are 24 students in Mrs.Smith's 1st block class. 1/4 of the class passed the math test with an A. 12 students in the class passed the math test with a B. What percent of the students in the class passed the test? 
Statistics
A researcher predicts that watching a film on institutionalization will change studentsâ€™ attitudes about chronically mentally ill patients. The researcher randomly selects a class of 36 students, shows them the film, and gives them … 
Statistics
A history class is comprised of 5 female and 8 male students. If the instructor of the class randomly chooses 8 students from the class for an oral exam, what is the probability that 2 female students and 6 male students will be selected? 
math
One day during flu season, 1/3 of the students in a class were out sick, and only 24 students were left. How many students are in the class?