Economics 2122 A
Assignment 1
Answer Key
Question 1.69
Cross table and bar chart of drink preference vs. type of vehicle
Vehicle
Pickup
Car
Subtotal
Beer
71
32
103
Wine
29
68
97
Subtotal
100
100
200
Q
Assignment 2
Answer Key
Question 3.67
Let G good part, D defective part
a)
b)
c)
d)
e)
f)
P(D) = .1
P(B) = .35
P(D|B) = P(B D)/P(B) = .05/.35 = .1429
P(B|D) = P(B D)/P(D) = .05/.1 = .5
No, since P(GB)
Economics 2122 A
Assignment 4
Answer Key
Question 2.51
In one year, growth of 500 largest U.S. corporations had a mean of 9.2%, standard deviation of 3.5%.
a. Find the range in which it can be guarant
Economics 2122 A
Assignment 5
Answer Key
Question 8.7
Using independent random samples, find a 95% confidence interval estimate of the difference in the means of
the two populations
( x y ) z / 2
2
25
Economics 2122 A
Assignment 3
Answer Key
Question 5.19
X follows a normal distribution with = 50 and 2 = 64
60 50
) = P(Z > 1.25) = .1056
8
35 50
62 50
b) Find P(35 < X < 62). P(
<Z<
) = P(-1.88 < Z <