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STA2023 Quiz 4 EXAM QUESTIONS 7 TERMS WITH VERIFIED DEFINITIONS UPDATED 2024
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STA2023 Quiz 4 EXAM QUESTIONS (7 TERMS) WITH VERIFIED DEFINITIONS UPDATED 2024
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STA2023 Quiz 4 Study Guide Questions andCorrect Answers
1). At uf, there are always a few days between the end of classes and the beginning of final
exams. these days are meant as a study period, but some students would prefer to take the
exams as soon as possible, to have a longer vacation - in fact, some students even leave
gainesville during those days as a mini-vacation. to see if the student body supports
abolishing "dead week", the student government decides to conduct a survey. they conduct a
phone survey (with local numbers selected at random from the student directory) calling
people during "dead week". will this sample be representative of all uf students?
Ans: No, since not all students have local phone numbers.
2). The cost of tuition is a very important topic. the alligator surveyed 500 randomly selected
students and asked them if they supported a 5% tuition increase. what kind of study is this?
Ans: Survey
3). A high positive correlation is found between college students' age and their gpa. however, if
one student aged 44 with a high gpa is omitted from the study, the correlation all but
disappears. this is an example of:
Ans: influential outlier
4). Suppose that you recorded the number of television sets per person and the average life
expectancy for the world's nations. there is a high positive correlation: nations with many tv
sets have higher life expectancies.
Ans: The response variable is: the nation's life expectancy, in years
The explanatory variable is: the number of TV sets per person
The experimental units are: the nations
The lurking variable that acts as a confounding factor in this study is: the nations' wealth
5). A survey asks participants if they support or oppose the building of new football stadium. if
there are 80 respondents (selecting using a simple random sampling method) to a survey,
what is the approximate margin of error?
Ans: 0.1118
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