STAT 200 Midterm Exam (Section 103, MWF 2pm)
(Time:
50 minutes
,
Wednesday, October 27, 2010, 2:00  2:50pm, I
)
Name:
Student ID:
This exam is to be done with closed notes/books. One “cheat sheet” (
8
.
5
×
11
, two sided) is
allowed. Make sure you write
your name and student ID
.
Problem 1
(10 pts). Circle the correct answer: true (T) or false (F) (one answer only).
(1) There is only one way for a set of numbers to have standard deviation of zero and that is
to have identical numbers.
T
F
(2) A measure of spread (or spreadout) gives some idea about the size of the mean.
T
F
(3) Although the probability of an event (on a single trial) occurring is 0.95, the event may
not occur at all in 5 independent trials:
T
F
(4) The mean of the sampling distribution of the sample mean is equal to the population
mean.
T
F
(5) The sample mean always underestimates the population mean because of sampling vari
ation.
T
F
Problem 2
(40 pts). Circle the (one) answer that is the most appropriate.
(1) What type of distribution is described by the following information: the mean is much
larger than the median and the distribution is unimodal (assuming there is no outlier)?
(a) skewed to the left (i.e., longer left tail).
(b) symmetric.
(c) skewed to the right
(i.e., longer right tail).
(d) Bellshaped.
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 Spring '08
 KARIM
 Standard Deviation, MATHEMATICS DEPARTMENT

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