a)
Check
whether
it
can
be
asserted
with
98%
confidence
that
the
underlying
yearly
real
variance
of
the
portfol
Sigma^2=
440
Ho:
sigma^2
=
440
H1:
sigma^2
not
=
440

Statistic

4.9

With
98%
confidence
Lower
limit 3.05348411
Upper
limit 24.7249703
With
98%
confidence
we
cannot
reject
Ho
since
the
statistic
is
inside
the
acceptance
zone
b)
Check
the
same
hypothesis
with
95%
confidence.

With
95%
confidence
Lower
limit 3.81574825
Upper
limit 21.9200493
With
95%
confidence
we
cannot
reject
Ho
since
the
statistic
is
inside
the
acceptance
zone
Question
2
Typical
variance
Number
of
students
New
variance
Normal
population

300
30
480

a)
Check
whether
the
hypothesis
that
the
population
variance
of
their
scores
is
300
can
be
accepted
with
95
%

Ho:
sigma^2
=
300
H1:
sigma^2
not
=
300

Statistic
46.4

Lower
limit 16.0470717
Upper
limit 45.7222858
We
can
reject
Ho
with
95%
confidence
since
it
falls
outside
of
the
interval

b)
Check
with
90%
confidence
the
hypothesis
that
the
population
variance
of
the
scores
is
greater
or
equal
than
Ho:
sigma^2
>=
300
H1:
sigma^2
Question
3
Variance_1
114.09 during
4
years
Variance_2
16.08 following
7
years
Normal
distribution
a)
Test
whether
the
two
population
variances
can
be
considered
equal
with
95
%
confidence.
Ho:
sigma1^2
=
sigma2^2
H1:
sigma1^1
not
equal
to
sigma2^2
Lower
limit
Upper
limit

Statistic

7.09514925

0.06786692
6.59879852

We
can
reject
Ho
with
95%
confidence
since
it
falls
outside
of
the
interval

b)
With
95%
confidence,
test
the
hypothesis
that
the
population
variance
of
the
shares
during
the
years
of
com
Ho:
sigma1^2
>=
sigma2^2
H1:
sigma1^1
<
sigma2^2
Limit

0.11184875

We
cannot
reject
Ho
with
95%
since
it
is
higher
than
the
limit.
Question
4
Percentage
of
forecast
error
Corporation Analyst
A
Analyst
B
1
12.3
7.3
2
15.4
12.1
3
5.3
7.4
4
9.2
8.1
5
8.6
11.3
6
14.2
12.3
7
5.2
3.1

...
MBA 501A – [STATISTICS]
ASSIGNMENT 4
INSTRUCTIONS: You are to work independently on this assignment. The total number of points possible is 50. Please note that point allocation varies per question. Use the Help feature in MINITAB 16 to read descriptions for the data sets so that you can make meaningful comments.
[10 pts] 1. Use the data set OPENHOUSE.MTW in the Student14 folder. Perform the Chi
Square test for independence to determine whether style of home and...

...alternative hypothesis should state µ1 − µ2 > 0 ANSWER: c
2.
A Type I error is committed when a. a true alternative hypothesis is not accepted b. a true null hypothesis is rejected c. the critical value is greater than the value of the test statistic d. sample data contradict the null hypothesis ANSWER: b In determining an interval estimate of a population mean when σ is unknown, we use a t distribution with a. n − 1 degrees of freedom
3.
b. c. d. ANSWER: 4.
n...

...grams. D) 95% of reduced fat cookies have between 3.4 and 5 grams of fat. E) 95% of the cookies in the sample had between 3.4 and 5 grams of fat. Determine the margin of error in estimating the population parameter. 12) How tall is your average statistics classmate? To determine this, you measure the height of a random sample of 15 of your 100 fellow students, finding a 95% confidence interval for the mean height of 67.25 to 69.75 inches. A) 1.5 inches B) 0.25 inches C) 1.06...

...1. A radio station that plays classical music has a “By Request” program each Saturday night. The percentage of requests for composers on a particular night are listed below:
Composers Percentage of Requests
Bach 5
Beethoven 26
Brahms 9
Dvorak 2
Mendelssohn 3
Mozart 21
Schubert 12
Schumann 7
Tchaikovsky 14
Wagner 1
a. Does the data listed above comprise a valid probability distribution?...

...1. Introduction
This report is about the case study of PAR, INC. From the following book: Statistics for Business an Economics, 8th edition by D.R. Anderson, D.J. Sweeney and Th.A. Williams, publisher: Dave Shaut. The case is described at page 416, chapter 10.
2. Problem statement
Par, Inc. has produced a new type of golf ball. The company wants to know if this new type of golf ball is comparable to the old ones. Therefore they did a test, which consists out of 40...

...
Final Project: Nyke Shoe Company
Barbara Greczyn
STA 201 - Principles of Statistics
Instructor Alok Dihtal
April 26, 2015
Introduction
Nyke Shoe Company has been in business for over 50 years. Over the last five years, the company has been undergoing some financial hardship due to an erratic market and an inability to understand what the consumer actually needs. In a last ditch effort to avoid bankruptcy, they have adopted a new business model...

...PEARSON’S PRODUCT-MOMENT CORRELATION COEFFICIENT
ANSWERS TO EXERCISE 23
Question 1
The r value for the relationship between Hamstring strength index 60o and the Shuttle run test is -0.149. This r value shows a weak correlation between the two variables, as it is less than the 0.3 threshold for significance. Therefore, the r value is not significant.
Question 2
Between r=1.00 and r=-1.00, there is no difference in terms of strength. Both values are on the extreme ends of the...

...indicated to what kind of test was going to be used and since I claimed that the rural area were going to have a lower average number of beds it states that the shaded area on the critical value test will be less than zero.
Table 1. Descriptive statistics for the given null and alternative hypothesis that includes the sample, mean, median, standard deviation, maximum values, and minimum values.
Sample Size
Mean
Median
Standard Deviation
Maximum Value
Minimum Value
Rural Area...