Mid-semester Exam 1 Solutions
1. Every day I see the same 9 runners pass my house - three men (Alfred, Bob, and
Christopher) and six women (Delilah, Edith, Frannie, Georgina, Hattie, and Idell).
One of the men (Bob) and two of the women (Edith and Hattie)

Section 10.6 Examples
Problem: Construct a 98% condence interval for 2 from the following data:
4.9, 5.2, 5.9, 4.8, 4.5, 5.1
Problem: A new method for measuring room temperature is developed, and a sample of
measurements (shown below) of a room having tru

Exam 2 Soultions Fall 2010 ACMS 20340
1. X is normal, so standardize and do a table look-up:
P (X < 0.5) = P (Z <
0.5 0
= P (Z < 0.25) = 0.5987
2
For your reference the answer choices in the test should have been (a)
0.6915, (b) 0.5987, (c) 0, (d) 0.8413,

1. Let X be normal with mean X = 0 and X = 2. What is the probability X is less than 0.5?
(a) 1
(b) 2
(c) 3
(d) 4
2. Suppose I roll a fair six-sided die 150 times. (whew!) Let X be the
number of times I rolled a 6. Which is a good estimate of P (X > 30)?

Exam 1 Soultions Fall 2010 ACMS 20340
1. The rst part is essentially asking for P (A B ). There are two ways of
doing this. The rst way starts with the addition formula P (A B ) =
P (A) + P (B ) P (A B ). We know P (A) and P (B ). Event C is the
complemen

1. A researcher studying butteries in St. Joseph County makes observations at random places throughout the county. She has noted that
at 60% of the locations she observes Meadow Fritillaries, and that at
15% of the locations West Virginia Whites are obser

Math 20340: Statistics for Life Sciences
Fall 2008 Mid-semester Exam 3 Solutions
1. Achievement test scores of all high school seniors in a certain state have mean 60. A random
sample of 100 students from one large high school had a mean score of 58, with

Math 20340: Statistics for Life Sciences
Fall 2008
Mid-semester Exam 2
Solutions
1. Answer these questions using the standard normal table included at the end of this exam. In the
rst two parts, z is a standard normal.
1. Find a z0 such that P (z > z0 ) =

Math 20340: Statistics for Life Sciences
Fall 2008
Mid-semester Exam 1
Solutions
1. I roll a dice and look at the number that comes up (so there are six simple events, namely
1, 2, 3, 4, 5 and 6, and each occurs with probability 1/6). I am interested in t

Exam 3 Review
When: Wednesday, April 20 in class.
What to bring: you may bring a calculator (no phones/laptops etc) and one 8.5 x 11
sheet of paper (both sides are ne, but it must be handwritten)
Covers: Sections 8.1-8.9, 9.1-9.6, 10.1-10.3 in textbook

Math 20340 Section 02: Statistics for Life Sciences
Spring 2011
Exam 3 Solutions
1. A store predicts that the average number of miles that a person can hike in their Chaco
sandals (before the strap breaks) is 5,200 miles. To test whether or not this reall

Exam 2 Review
When: Wednesday, March 9 in class.
What to bring: you may bring a calculator (no phones/laptops etc) and one 8.5 x 11
sheet of paper (both sides are ne, but it must be handwritten)
Covers: Sections 5.3, 6.1-6.4, 7.1-7.6 in textbook (you s

Math 20340 Section 02: Statistics for Life Sciences
Mid-semester Exam 2 Solutions
1. A Coke machine is set to ll 8-ounce cups. It is known that the number of ounces it
dispenses is normally distributed with mean 7.7 ounces and standard deviation 0.15
ounc

Exam 2 Extra Practice Solutions
1. Suppose that a medical parts supplier produces parts with a mean length of 1 cm.
Assume that the part lengths are normally distributed. How small should the standard
deviation be to guarantee that at least 97% of the par

Section 5.2 Example/Cumulative Binomial Probabilities
Problem: (Parts of exercise 5.28) Records show that 30% of all patients admitted to a clinic
fail to pay their bills, and the debts are eventually forgiven. Suppose the clinic treats 2000
dierent patie