MAT 121 Midterm: MAT121-2007Fall
MAT
121
Fall 2007
Final
Exam
December 10, 2007
Name:______________________________
Directions:
Students
must complete all
test
questions.
The
use
of
textbooks
is allowed,
but
notes not in
the
textbook are
NOT
allowed.
Students
are also allowed
the
use
of
a calculator. All work,
other
than
direct
calculations done
on
a calculator, MUST
be
shown. A correct answer
with
no work shown will receive NO
credit.
1.
The
following
is
a stem-and-Ieaf plot of the scores on a midterm of large statistics class of
58
students.
Stem
3
4
5
6
7
8
9
10
Leaf
0
013489
345678
12289
00112234457888999
01233333344577888999
000
(a)
Calculate the median and the mode
for
the above
data
set.
(b) Make a boxplot
for
the the above
data
set.
(Be
sure to
show
any calculations
that
you use.)
2.
Given below are
the
numbers of students in ten different MAT
121
recitations.
16
12
17
18
20
18
17
15
17
17
(a)
Calculate the mean of
the
sample.
(b) Calculate
the
standard deviation of the sample.
(c) Calculate
the
variance of
the
sample.
(d)
Does the sample contain any outliers? Use z-scores
to
justify your answer.
Document Summary
The use of textbooks is allowed, but notes not in the textbook are not allowed. Students are also allowed the use of a calculator. All work, other than direct calculations done on a calculator, must be shown. A correct answer with no work shown will receive no credit: the following is a stem-and-ieaf plot of the scores on a midterm of large statistics class of 58 students. 01233333344577888999 (a) calculate the median and the mode for the above data set. 000 (b) make a boxplot for the the above data set. (be sure to show any calculations that you use. : given below are the numbers of students in ten different mat 121 recitations. Does it suggest that the gender-selection method appears to be effective: a certain slot machine is configured so that there is a 1/2000 probability of winning the jackpot on any individual trial.
