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STA 2023 Honors
Name
____________________________
Exam 3
UF ID# ___________________________
1.
How involved are students in extracurricular activities – clubs, organized sports, social or
religious groups, student government?
A survey asked a random sample of students questions
related to their extracurricular activities.
Each of the five situations presented below describes an
inference that we would like to make about a different parameter.
Match each of the five
situations below with the parameter of interest from the list:
(10 pts)
a)
one mean
b)
one proportion
c)
difference of two independent means
d)
difference of two independent proportions
e)
mean of paired differences
___
Compare the average number of hours per week spent on extracurricular activities for
upperclassmen
(Juniors and Seniors) and underclassmen (Freshmen and Sophomores).
___
Compare the average number of hours per week spent on extracurricular activities for each
student now and when they were in high school.
___
We discover that 23 out of 150 students in the sample are involved in four or more
organizations.
___
We note that 15 out of 75 men and 18 out of 75 women in our sample are not involved in
any organizations.
___
We find that, on average, students are involved in 1.7 different organizations.
2.
Several recent best seller books were selected and their prices compared at two websites:
BAMM.com (Books a Million) and Borders.com.
We will compare their prices with a matched pairs
p
r
o
c
e
d
u
r
e
:
(
2
0
p
t
s
)
Item
BAAM.com
Borders.com
Cesar's Way
16.08
24.95
The World Is Flat
17.67
30.00
State of Denial
21.00
30.00
Ultrametabolism
32.95
29.95
An Inconvenient Truth
16.10
23.00
Nineteen Minutes
15.57
18.86
Oracle Bones
17.97
26.95
The WalMart Effect
10.00
15.00
The Omnivore's Dilemma
17.37
26.95
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View Full Documenta)
Compute the mean and standard deviation of the differences:
x
= ____________
s= ____________
(4 pts)
Note
:
If you don’t know how to do this, use
x
=

7 and s = 4.4 for the rest of the problem.
b)
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 Spring '08
 Ripol
 Statistics

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