Download Midterm 1, Version 1

C22.0103.04
MIDTERM 1 (VERSION 1)
Name:________________________
This is the answer sheet. Circle the choice which best answers each question on
the exam. Do not write anything else on this sheet (besides your name and the
circles). When you are finished, hand in just this answer sheet. You can keep the
question sheets. There are 15 questions, each worth 5 points. Everyone receives
25 points for free. Good Luck!
1) (A) (B) (C) (D) (E)
11) (A) (B) (C) (D) (E)
2) (A) (B) (C) (D) (E)
12) (A) (B) (C) (D) (E)
3) (A) (B) (C) (D) (E)
13) (A) (B) (C) (D) (E)
4) (A) (B) (C) (D) (E)
14) (A) (B) (C) (D) (E)
5) (A) (B) (C) (D) (E)
15) (A) (B) (C) (D) (E)
6) (A) (B) (C) (D) (E)
7) (A) (B) (C) (D) (E)
8) (A) (B) (C) (D) (E)
9) (A) (B) (C) (D) (E)
10) (A) (B) (C) (D) (E)
Please do not write on this side
C22.0103
MIDTERM 1 (VERSION 1)
1) The mean of the data set {10, 2, 1, 3, 4} is
A) 1 B) 3 C) 4 D) 5 E) 10
2) The median of the data set {10, 2, 1, 3, 4} is
A) 1 B) 3 C) 4 D) 5 E) 10
3) Consider the sample data set {3, 3, 3, 3, 3}. Which of the following is true:
A) The mean is equal to the median.
B) The interquartile range is 3.
C) The sample standard deviation is 3.
D) The 75’th percentile is 4.
E) None of the Above.
4) Suppose we add 5 to each value in a data set. Which of the following will
happen:
A) The range will increase by 5.
B) The standard deviation will increase by 5.
C) The interquartile range will increase by 5.
D) The mean will increase by 5.
E) None of the above.
5) Suppose that for a certain data set the range is zero. Which must be true:
A) The sample median is zero.
B) All data values are zero.
C) The sample standard deviation is equal to the interquartile range.
D) The 75’th percentile is less than the median.
E) None of the Above.
6) If all values in a data set are doubled, the mean, median, range, sample
standard deviation and interquartile range will
A) All decrease B) All double C) All remain unchanged
D) Change by different amounts E) None of the above.
7) Which of the following is not a statistic:
A) The sample mean B) The sample standard deviation
C) The range D) The population standard deviation.
8) The events A={You will wake up before 8 AM tomorrow} and B={You will
wear red socks tomorrow} are
A) Independent B) Mutually Exclusive C) Complements of each other
D) None of the Above.
9) Suppose A, B are mutually exclusive events with P(A) = .4, P(B) = .5. Then
P(AB) is equal to:
A) .9 B) .4 C) .5 D) Zero E) It cannot be determined.
10) Suppose that 80% of computer users use Microsoft products, and 90% of
Microsoft users use the Microsoft Word software. What percentage of
computer users use Word?
A) 80% B) 75% C) 72% D) 90% E) None of the Above.
11) Suppose a fair coin is tossed 10 times. Let A={First five tosses are Heads},
B={Last five tosses are Tails}. The conditional probability P(B|A) is:
A) 1/2 B) 0 C) 1 D) 1/1024 E) 1/32.
12) In Problem 11, the events A and B are
A) Independent B) Mutually Exclusive C) Impossible
D) Dependent E) It cannot be determined from the given information.
13) Let A={Apple Computer stock price goes up tomorrow},
B={Apple goes down tomorrow},
C={Apple remains unchanged tomorrow}.
(In all cases, the change in the stock price is calculated as the difference
between tomorrow’s and today’s closing prices.)
Suppose P(A) = .6, P(B) = .3. Then P(C) is equal to:
A) 0 B) .1 C) .5 D) 1 E) None of the Above.
14) In Problem 13, we have P(A|B) = :
A) Zero B) .6 C) 1 D) It cannot be determined.
15) In Problem 13, we have P(AB) = :
A) Zero B) .3 C) .6 D) .9 E) .72.