Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Assignment 2 Solutions
1.
(i)
P (X > 2) = P (X = 3) + P (X = 4) + P (X = 5)
= 0.08 + 0.05 + 0.02
= 0.15
(ii) The cdf of X is
x
0
P (X x) 0.60
1
2
0.75 0.85
3
4
0.93 0.98
5
1
(iii)
E (X ) =
STAT 101 (Groups 2, 3, & 4) : In-class Quiz 8
Term I, 2010/2011
Name_Group_Number_
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Solve the problem.
1) A significance level for a hypothesis test is g
STAT 101 (Groups 2, 3, & 4) : In-class Quiz 10
Term I, 2010/2011
Name_Group_Number_
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) If the population correlation between two variables is determined
STAT 101 (Groups 2, 3, & 4) : In-class Quiz 4
Term I, 2010/2011
Name_Group_Number_
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Solve the problem.
1) Management at a home improvement store randomly
STAT 101 (Groups 2, 3, & 4) : In-class Quiz 9
Term I, 2010/2011
Name_Group_Number_
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) The marketing manager for an automobile manufacturer is interested
STAT 101 (Groups 2, 3, & 4) : In-class Quiz 7
Term I, 2010/2011
Name_Group_Number_
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which of the following factors do not affect the margin of error?
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 9 Solutions
1.
Given that xA = 120, sA = 29.25, nA = 180 and xB = 111, sB = 28.95, nB = 160
We need to assume that the variances of bills in city A and city B are the same an
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 10 Solutions
1.
(i) Based on the data, we nd
n = 12,
xi = 8589,
yi = 103.34,
2
x2 = 6450413,
yi = 922.035
i
b1 =
xi yi = 76997.25,
SSXY
(76997.25) (8589)(103.34)/12
3031.645
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 8 Solutions
1.
Let be the population mean amount in ounces.
(i) H0 : = 8.17
H1 : = 8.17
Since the sample size (n = 60 > 30) is sucient large, by the Central Limit
Theorem, th
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 7 Solutions
1.
(i) Given that x = 21.34, s = 8.53 and t0.025,449 1.96
We do not need to make any assumption. Since the sample size is relatively
large, the sample mean is app
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 1 Solutions
1.
It is unethical and impractical to force a group of students buying the recommended
textbooks and to restrict the other group of students not buying the textbo
STAT 101 (Groups 2, 3, & 4) : In-class Quiz 5
Term I, 2010/2011
Name_Group_Number_
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) A standard normal distribution is a normal distribution with:
A) a
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Assignment 5 Solutions
1. Let d be the mean dierence of sales of non-sale items between the store with campaign
and the paired store without campaign.
(i) H0 : d = 0
H1 : d = 0
Since the sa
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Assignment 4 Solutions
1.
(i) Given that x = 15.3, s = 3.8, n = 340, and t0.025,339 1.96 (exact value t0.025,339 =
1.9670).
We do not need to make any assumption. Since the sample size (n =
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS GROUPS 2, 3, & 4
Assignment 4
Deadline of submission: During the class session in Week 11
1.
A market researcher for a consumer electronics company wants to study the television
viewing habits of residents of
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS GROUPS 2, 3, & 4
Assignment 3
Deadline of submission: During the class session in Week 7
1.
Suppose that an intelligence test is constructed to have a normal distribution with a
mean of 100 and a standard dev
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS GROUPS 2, 3, & 4
Assignment 2
Deadline of submission: During the class session in Week 5
1.
Using historical records in the last ten years, the personnel manager of a plant has
determined the probability dist
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS GROUPS 2, 3, & 4
Assignment 1
Deadline of submission: During the class session in Week 4
1.
A general contractor has submitted two bids for two projects: A and B . The probability
of getting project A is 0.60
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Assignment 3 Solutions
1.
Let X be the IQ score of randomly selected person. Then, X N ( = 100, 2 = 152 )
(i)
P (85.9 < X < 118.6) = P
118.6 100
85.9 100
<Z<
15
15
= P (0.94 < Z < 1.24) = 1
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Assignment 1 Solutions
1.
(i) Let A and B be the event that he gets Project A and Project B , respectively.
You are given that P (A) = 0.6, P (B ) = 0.75 and P (A B ) = 0.85
P (A B ) = P (A
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS GROUPS 2, 3, & 4
Assignment 5
Deadline of submission: During the class session in Week 13
1.
In order to measure the eect of a store-wide sales campaign on non-sale items, the research
director of a national