Exercise9.1
SelfCheckExercises
SC 9-1 Two independent samples of observations were collected. For the first sample of 60
elements, the mean was 86 and the standard deviation 6. The second sample of 75 elements
had a mean of 82 and a standard deviation of
ChapterConceptsTest
Circle the correct answer or fill in the blank.Answersareinthebackofthebook.
TF
1.
The value of every observation in the data set is taken into account when we calculate its
median.
TF
2.
When the population is either negatively or pos
Exercise8.2
SelfCheckExercises
SC 8-1
SC 8-2
How many standard errors around the hypothesized value should we use to be 99.44 percent
certain that we accept the hypothesis when it is true?
An automobile manufacturer claims that a particular model gets 28
Exercise11.2
SelfCheckExercises
SC 11-1 A brand manager is concerned that her brands share may be unevenly distributed
throughout the country. In a survey in which the country was divided into four geographic
regions, a random sampling of 100 consumers in
Exercise17.2
SelfCheckExercise
SC 17-1 The Writers Workbench operates a chain of word-processing franchises in college towns. For
an hourly fee of $8.00, Writers Workbench provides access to a personal computer, word-processing software, and a printer to
Exercise12.1
SelfCheckExercise
SC 12-1 An instructor is interested in finding out how the number of students absent on a given day is
related to the mean temperature that day. A random sample of 10 days was used for the study.
The following data indicate
Chapter Concepts Test
Circle the correct answer, or fill in the blank. Answers are in the back of the book.
TF
1.
Analysis of variance may be used to test whether the means of more than two
populations can be considered equal.
TF
2.
Analysis of variance i
Exercise5.2
SelfCheckExercises
SC 5-1
Construct a probability distribution based on the following frequency distribution.
Outcome
Frequency
SC 5-2
102
10
105
20
108
45
111
15
114
20
117
15
(a) Draw a graph of the hypothetical probability distribution.
(b)
Exercise7.2
SelfCheckExercises
SC 7-1
The Greensboro Coliseum is considering expanding its seating capacity and needs to know
both the average number of people who attend events there and the variability in this number.
The following are the attendances (
Exercise14.2
WorkedOutAnswerstoSelfCheckExercises
SC 14-1
Before
8
7
6
After
6
5
8
Sign
+
12 responses: 4(+), 6(), 2(0).
9
6
7
9
+
10
8
8
10
+
6
7
+
5
5
0
8
6
10
9
8
8
0
For n 10, p 0.5, the probability of 6 or more minuses is 0.3770 (Appendix Table 3).
B
Chapter Concepts Test
Circle the correct answer, or fill in the blank.Answersareinthebackofthebook.
TF
1.
Decision theory assumes that no events are beyond the control of the decision
maker.
TF
2.
A conditional profit table does not reflect the profit den
Exercise10.3
WorkedOutAnswerstoSelfCheckExercises
SC 10-1 (a) x =26.7
R =5.3n = 9d2 = 2.970
CL = x = 26.7
UCL = x +
LCL = x
(b)
3R
d2 n
3R
d2 n
=26.7 +
=26.7 -
x =138.6
3(5.3)
=28.5
2.970 9
3(5.3)
2.970 9
=24.9
R =15.1
n =17
CL = x =138.6
UCL = x +
LCL =
Exercise10.3
SelfCheckExercise
SC 10-1 For each of the following cases, find the CL, UCL, and LCL for an chart based on the given
information.
(a) n 9, x 26.7, R 5.3.
(b) n 17, x 138.6, R 15.1.
(c) n 4, x 84.2, R 9.6.
(d) n 22, x 8.1, R 7.4.
SC 10-2 Altoo
Exercise9.1
WorkedOutAnswerstoSelfCheckExercises
SC 9-1 s1 6n1 60
x1
x2
86s2 9n2 75
82
(a)
(b) H0: 1 2H1: 1 2a 0.01
The limits of the acceptance region are z 2.58, or
Because the observed z value
(86 - 82) - 0
x - x2
1.296
3.09 > 2.58 ( 1
or 86 82 4 >
Exercise8.2
WorkedOutAnswerstoSelfCheckExercises
SC 8-1
To leave a probability of 1 0.9944 0.0056 in the tails, the absolute value of z must be
greater than or equal to 2.77, so the interval should be 2.77 standard errors about the
hypothesized value.
SC
Chapter Concepts Test
Circle the correct answer or fill in the blank. Answers are in the back of the book.
TF
1.
p charts are used to monitor categorical variables with two possible values.
TF
2.
Statistical process control was originally developed in Jap