STATS 10…Quite possibly the greatest course ever created…
Fall 2006
Practice Final
Adam’s Sections
“Do not worry about your difficulties in Mathematics.
I can assure you mine are still greater.”
Albert Einstein
Question 1)
Two students are hired by Murphy Hall to work on a project. Student A is supposed
to choose a stratified random sample of students (stratification is done by gender and major) and
ask them if they are for eliminating SAT scores from admission requirements to UCLA. Student
B is supposed to administer a questionnaire to all freshmen that were admitted to UCLA in Fall
2004. The objective of this questionnaire is to find out what other schools they were admitted to
and if UCLA was their first, second, or third choice.
What is the best answer?
a)
Student A is conducting inferential statistics and student B is doing descriptive statistics.
b)
Student B is conducting inferential statistics and student A is doing descriptive statistics.
c)
We need the actual data (percentages, means, and standard deviations) to decide which
student is doing inferential and which one is doing descriptive statistics.
d)
One needs the standard error of measurement to conduct inferential statistics and so
neither students A nor student B is doing inferential statistics.
Question2)
A researcher has collected the following data on a random sample of 500 students:
Ethnic background (Caucasian, African American, Latino, Others)
Grade point average in college
Gender
SAT scores
What would be the best way for examining the relationship between 1) gender and
ethnic background, and 2) SAT and college GPA
1
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Question 3)
A school district has five high schools. Suppose that
•
30% of the high school students who attend this district are involved in some kind of
sport after school.
•
40% of those who are involved in some kind of sports after school are male, and
•
50% of those who are not involved in any kind of sport after school are female
Suppose that you randomly select a student. Given that this student is male, what is the
probability that he is involved in some kind of sport?
Question 4)
In a country 40% of the people believe that when working women become pregnant,
they should stay home for one year to take care of their baby. A governor wonders whether the
opinion of the people in her state is different from the overall population. She hires a polling
agency to investigate this issue. In a random sample of 1200 individuals, 450 have the same
opinion as the overall population.
What is the P value?
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 Fall '08
 Ioudina
 Normal Distribution, Standard Deviation, general population

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