HW Section 2.2
(2.47- 2.51, 2.53, 2.57, 2.60)
2.47. Solution:
(a) r .= 0.5194.
(b) The first-test/final-exam correlation will be lower, because the relationship is weaker. (See the next
solution for confirmation.)
2.48. Solution:
(a) r =. 0.2013.
(b) The
HW Section 2.1
(2.13, 2.15, 2.16, 2.17, 2.18, 2.19, 2.24, 2.25, 2.29, 2.33, 2.34, 2.35)
2.13. Solution:
(a) A boxplot summarizes the distribution of one variable. (Two [or more] boxplots can be used to
compare two [or more] distributions, but that does no
Name: _ Date: _
1. Determine whether each of the following statements is true or false.
A) The margin of error for a 95% confidence interval for the mean increases as the
sample size increases.
B) The margin of error for a confidence interval for the mean
HW2: Section 1.2
1. The value of brands. (brands.xls). A brand is a symbol or images that are associated with a
company. An effective brand identifies the company and its products. Using a variety of
measures, dollar values for brands can be calculated. T
Stat 207: Midterm-1 (Version A)
University of Dammam
Date: Wednesday, March 20, 2013
Duration: 60 minutes.
Instructor: Dr. Nahid Sultana
Name:_
Student ID Number: _Solution_
Group: _
Instructions:
This test consists of 15 multiple choice questions worth 1
4.19 Whats wrong? In each of the following scenarios, there is something wrong. Describe
what is wrong and give a reason for your answer.
a) If two events are disjoint, we can multiply their probabilities to determine the probability
that they will both o
Stat 207: Midterm-2 (Version A)
University of Dammam
Date: Saturday, May 4, 2013
Duration: 60 minutes.
Instructor: Dr. Nahid Sultana
Name:_
Student ID Number: _
Group: _
Instructions:
This test consists of 23 multiple choice questions worth 1 mark each (n
Practice Questions
Chapter 4 & 5
Use the following to answer questions 1-3:
Ignoring twins and other multiple births, assume babies born at a hospital are independent events
with the probability that a baby is a boy and the probability that a baby is a gi
Name: _ Date: _
1. Which of the following statements about a density curve are FALSE?
A) A density curve always has area beneath it equal to 1.
B) A density curve can adequately describe outliers observed in data.
C) A density curve is always on or above
HW Section 2.3
(2.66, 2.67- 2.69, 2.73, 2.83, 2.84)
2.66. Solution:
(a) Scatterplot:
(b) The association appears to be roughly linear.
(c) The regression equation is
(d) Regression on population explains
of the variation in open space.
2.67. Solution:
Res
1. Employee application data. The personnel department keeps records on all employees in a company. Here is
the information that they keep in one of their data files: employee identification number, last name, first name,
middle initial, department, numbe