Posted by jane on Tuesday, February 12, 2008 at 1:36pm.
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?

statistics  SraJMcGin, Tuesday, February 12, 2008 at 1:54pm
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.

statistics  PsyDAG, Wednesday, February 13, 2008 at 11:16am
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.
Answer This Question
Related Questions
 AE.. does it sound ok  Constructivism Constructivism is an educational theory ...
 MAth  14 students in an Algebra class were asked to shake hands with each other...
 Statistics  A researcher predicts that watching a film on institutionalization ...
 Math  There are 24 students in Mrs.Smith's 1st block class. 1/4 of the class ...
 Statistics  A history class is comprised of 5 female and 8 male students. If ...
 statistics: dependent event  A psychology class is comprised of 4 female and 6 ...
 math  One day during flu season, 1/3 of the students in a class were out sick, ...
 English  1) Four American 17yearold students will be in class with us ...
 8th grade math  A group of 1,500 high school students were asked to fill out a ...
 Psychological Statistics  A researcher predicts that watching a film on ...
More Related Questions