HW#4 - Solution
1) The probability distribution of the number of children you might have one day is none with 30% chance, one with 20%
chance, two with 30% chance, three with 10% chance and four with 10% chance.
a) What is the expected number of children
Chapter 18
Residual is defined as the actual value of y and the estimated value of y The standard deviation of the error variable is assumed to be 1.0 The p-value is found using the t-test A one-tailed p-value is one half the size of a two-tailed te
About Hypothesis Testing:
To conduct a statistical test of hypotheses, we must first have two hypotheses: the
null hypothesis and the alternative hypothesis. The null hypothesis, denoted by H0,
is a statement that nothing is happening. The specific null h
ECO250
Fall 2011
SECOND MIDTERM
On my honor, I have neither given nor received unauthorized aid on this assignment.
Your Printed Name
Your Full Signature
1) You have 50 minutes for 120 points plus bonus
2) There are 150 points in this exam you are respons
1) The a priori probabilities of you possible grade in the midterm are: A= 10%, B = 20%, C = 30%, D =
20%, F = 20%. Translate the grades into the 4 point (GPA) scale.
a) What is your expected grade?
E(X)= 0.1*4+0.2*3+0.3*2+0.2*1+0.2*0 = 1.8 (= C-)
b) What
Fall 2011
SECOND MIDTERM
Solution
Question 1 (30 points 10 points each part):
Blayne usually flies out of Atlanta Hartford International Airport. Over the years he observed 225
random flights and noticed that 150 of them where on time.
a) Construct the 95
HW#6
Due Tuesday, November 6th
1) The time it takes my students to finish the stats exam is UNIFORMLY distributed between 25 and 75
minutes.
a) What is the chance that a student finishes his exam in between 30 and 40 minutes?
b) If the class size is 110 s
BUAD250
Study Guide MT#2
Review session is Monday at 7pm.
Office hours until the midterm:
Friday afternoon for a bit (I dont know when yet I have an important research call at some point)
Monday 2-5
Same cheat sheet rule as last time one 3 by 5 inch note
HW#5
Due Tuesday, October 30th in class
1)
a)
b)
c)
d)
e)
f)
g)
h)
i)
j)
k)
l)
Z~N(0,1) pay attention to the minus signs!
P(Z < 0.43) =
P(Z < -0.63) =
P(Z > 0.74) =
P(Z > -1.49) =
P(0.21 < Z < 0.43) =
P(-0.89 < Z <1.46) =
P(-1.99 < Z < -1.88) =
P(Z < z) =