Exam 6: The Beast of Bias

You design a questionnaire to survey people's opinions about the increased tuition fees for undergraduate students at UK universities and administer it to 100 new undergraduate students,all of whom have paid the increased fee in 2012.You receive a 100% response rate.This is an example of?

To survey the opinions of football fans at Newcastle United's St.James' Park ground,you and your team of researchers plan to select every hundredth fan entering the stadium via the East Stand turnstiles at the next home match.Is this a simple random sample?

The undergraduate population of the University of Birmingham is formed of 25% ethnic minorities (non-white).When sampling 20 students at random,5 are from ethnic minorities.This shows?

Your head of department asks you to administer a survey to undergraduates about teenage pregnancies.You believe that male and female students might react differently to the survey questions as they are deliberately provocative.The male and female students are randomly assigned in turn to two separate groups.One of the two groups is asked the provocative questions and the other group are asked less provocative ones as a 'placebo'.Based on the above information,what has happened to the design of the study?