IDS 270 Practice Exam | 2024 Questions & Answers | 100% Correct | Verified

a telephone survey research company is not able to get a woman to answer questions about local traffic conditions because she is busy baking cookies - nonresponse bias a student polls his friends to get data regarding grades at his university and represents his findings as being representative of all students at that university - convient sample a certain IDS 270 instructor does not answer questions about his drinking habits while an undergraduate at the University of Michigan with complete accuracy - response bias Nightline posts results from a call in poll indicating that 60%of callers are in favor of gun control - volentary response bias a researcher wants to estimate costs of higher education. He first puts the entire set of colleges into groups that are relatively similar: Private colleges, 4 year universities, community colleges, etc. He then samples from each of these groups and gets the cost of attending the college from the sample. - stratified sampling mean of 2, 4, 6, 8 - 20/4=5 median of 2, 4, 6, 8 - add the two middle numbers and divide by two. 10/2=5