Decision Sciences
LeBow College of Business
Drexel University
3220 Market Street
Philadelphia, PA 19104
STAT 201 Intro to Business Statistics
Practice Midterm I
Name (Last, First) :
Student ID# :
Part I. T/F and Multiple Choice Questio
Statistical Inference I: J. Lee
Assignment 2
Problem 1. In your pocket, you have 1 dime, 2 nickels, and 2 pennies. You select 2 coins at random
(without replacement). Let X represent the amount (in cents) that you select from your pocket.
(a) Give (explic
Statistical Inference I: J. Lee
Assignment 1 Solution Notes
Problem 1. Solved in class.
Problem 2.
(a) either A or B occurs; P (A B) = P (A) + P (B) P (A B) = 0.35 + 0.51 0 = 0.86.
(b) A occurs but B does not; P (A B c ) = P (A) = 0.35, since A B c .
(c)
Statistical Inference I: J. Lee
Assignment 2 Solution Notes
Problem 1.
(a) By considering each possible outcome, we see that the possible
probability function is given by
2
(2)
= 0.1
(52)
(21)(21)
= 0.4
(52)
(2)
25 = 0.1
(2)
p(x) = P (X = x) =
1 2
(1)
Statistical Inference I: J. Lee
Assignment 1
Problem 1. An exam has 10 multiple choice questions where each question has 5 possible answers.
(a) If student goes into exam completely unprepared and guesses on all 10, what is the probability of
getting at l
Question-1 1Doulul10palrl15
Use Ihe lulluwmg Irllarrnatlorl lurquesllons 4 AND 5: A sample curlsllng or ve molemles ha a total energy 5e, Each molecule l5 able to occupy mndegenemle states at energy Je, wllh : 0, l, 2, etc, Congurallons at llIlS syslem a
Question 7 10 cam! 10 paims
(f 7. The whralmna wavenumberoi I215 214.5 crrH. Evauale Ihe vlbralmnal parl1l1anluncl1an expl1c1l1y (wuhaul appmmmanan) and 1.1101115 vaue as a functmn at Iemperalure. At whal Iemperalure 1s Ihe vaue w1lh1n 5% 0| Ihe value cac
Question 3
cfw_\7_ A certain molecule has a doubly degenerate exalted level lylng at 360 cmel above the nondegenerate ground level. At what temperature will 15% 01 the molecules be m the upper level? Answerwwtn two signmcant gures
Selected Answer: a 213
C
Questiun1 10 autot 10 points
Sf Match the follmwng terms with the correspondlrtg denitlon.
Questlorl Correct Match Selected Match
population 0 | Number ofmolecules in a particular state or level. 0 ll. Number ofmolecules m a pamcular state or level.
congu
Queslion 3 mental 1n pornls
cfw_7 Compute the mean energy at 400 K (If a mleve system at energy separatmrl equrvaem to 600 crrH. (Plane pravide youramwer rn 7X1D'L21 J, wrth 2 srgnicam gures).
Selected Answen Q 1.235
Correct Answer: 0 1 235
Answerrange +1
Question 8
cfw_f x The H20 molecule Is an asymmetnc rotor wrth rotational constants 213? cm1, 14.512 cm1, and 9.235 cm1. Calculate the rotational partition tunctlon of the molecule at 100 C.
L a
Selected Answen 0 121
Correct Answen Q 121
Answer range +f 2
Take 1
How many degrees of freedom would be used to test for a zero difference in means?
8 - N1 + N2 -2
In a left-ailed test comparing two means with variances unknown but assumed to be equal, the sample sizes
were n1 = 8 and n2 = 12. At = .05, the critic
For the final exam, study the following topics
One Problem - Bayesian Theorem
One problem - Binomial distribution/Poisson distribution
One problem - Normal distribution
One problem - Distribution of sample mean/Central Limit theorem
Three problems on Conf
Fall 2014: STAT 202 Business Statistics II SYLLABUS
Instructor - Dr. Girish Patwardhan
Department of Decision Sciences, LeBow College of Business
Office: LeBow Hall # 730
Office Hours: Monday 5:00 6:00 PM
Phone: 610-717-8064
E-mail: gp369@drexel.edu
This
Simple regression was employed to establish the effects of childhood exposure to lead. The effective
sample size was about 122 subjects. The independent variable was the level of dentin lead (parts per
million). Below are regressions using various depende
M&Ms are blended in a ratio of 9 percent brown, 13 percent yellow, 10 percent red, 20 percent blue, 1?
percent orange, and 3-1 percent green. Suppose you choose a sample of two M&Ms at random from a bag.
[a) How many elements are there in the sample space
v. F’(S and W} 0. 2550 1 0.0001
vi. F’W'and B} 02150 i 0. 000‘!
[by Do you see evidence that smoking and race are not independent?
Yes
[d1 1il'lI'hy might public health officials be interested in this type of data?
The health officials might target or des
[of Cal: ulate the following probabilities: {Round your answers to 4 decimal places.}
if. F’(L} ml
iii.P(H| C} ml
mile, E
v. PH. and 8) MI
vi. F’(L and C} MI
[bit Do you see evidence that noise level depends on flight phase?
Yes
Explanation:
in:
i. P(B)
Score: 81.081310 Paints 26.15 95
< Quasﬁon 5ror31} v >
5 . Award: 10 out of 10.00 polnts
ﬁrs a blrthday gm. you are rnaIlIng a new personal dlgltal asslsrant IPDﬁI] to your cousln In Toledo. The FDA
cost $209. There Is a 4 percent chance It wlll be lost o
[bl What is the probability that one of the next eight c ustomers who order beer will order light beer? {Round
your answer to 4 decimal plaoes.}
.0548 1.0001
Probability
[cl What is the probability that two of the next eight c ustomers who order b
Award: 0 out mono points 5'10“ W WT
Software filters rely heavily on “blacklists“ (lists of known “phishing‘ URLs) to detect fraudulent emails. But
such filters typically catch only 29 percent of phishing URLs. Jason receives 26 phishing emails.
[all What
Award: 334- out M1090 points
In Northern Yellowstone Lake, earthquakes occur at a mean rate of 1.5 quakes per year. Let X be the
number of quakes in a given year.
(a) Justify the use of the Poisson model.
Earthquakes are random and irkieperkient events.
[
(c) What are the quartiles? {Round your answers to 2 decimal plaoele
13" Quartile 14.501 0.01‘ inches persecond
3rd Quartile 35. 50 t 0. 01‘ inches per second
(d) What percentage of subway riders must reswipe the card because they were outside the
Score: 81.081810 Points
11.
Award: 0 out M1090 points
If the weight (in grams) of cereal in a box of Luc ky Charms is N(482,?), what is the pmbability that the box
will contain less than the advertised weight at 456 gm? Note: You may need to use Excel to
Score: 81.081310 Points
Award: 5 out (#1000 points
26.15 95
(
Question 9 [of 31]
Showmyanswar
The probability that a bakery customer will ordera birthday cake is 0.08.
[all What is the expected number of customers until the first birthday cake is ordere
Score: 81.08810 Points 26.15 95
< Question 12(o1'31} v >
1 2 . Award: 6.67 out mono points
Times fora surgical procedure are normally distributed. There are two methods. Method A has a mean of
26 minutes and a standard deviation of 4 minutes, while method