Question

Sixty-four people are asked to measure the width of a large room. The mean measurement is 9.78 metres with a variance of 63 squaredcentimetres. Assuming that the measurement errors are random (and normally distributed), the true width of the room is unlikely (i.e., = :05) to be less _____ than or greater than _______ .

(Hont; t-dist test)

Answer #1

Solution:

Confidence interval for population mean() using t distribution

Given that,

n = 64 ....... Sample size

= 9.78 ....... Sample mean

= 63 ........Sample variance

Note that, Population standard deviation() is unknown..So we use t distribution. Given,

= 0.05

/2 = 0.05 2 = 0.025

Also, n = 64 .....given

d.f= n-1 = 63

= = = 1.998

( use t table or t calculator to find this value..)

Now , confidence interval for mean() is given by:

9.78 - 1.998*(63/64) 9.78 +1.998*(63/64)

7.7973< < 11.7627

Answer: μ is unlikely ( = :05) to be less than 11.7627 or greater than 7.7973.

1. According to the Bureau labor of statistics, the mean weekly
earnings for people working in a sales-related profession in 2010
was $660. Assume the weekly earnings are approximately normally
distributed with a standard deviation of $75. If a salesperson was
randomly selected, find the probability that his or her weekly
earnings are at most $40.(choose the best answer)
a. .0004
b. .4246
c. .0478
d. .4182
e. .6255
2. A film distribution manager calculates that 8% of the films...

Example 1: Among females in the US in a given age cohort, a
diastolic blood pressure is normally distributed with mean µ = 95
mm Hg and standard deviation σ = 15 mm Hg. a) What is the
probability that a randomly selected woman has a diastolic blood
pressure less than 90 mm Hg? b) What is the probability that she
has a diastolic blood pressure greater than 95 mm Hg? c) What is
the probability that she has a...

PSYC 220: Homework 4
Note: In the case of decimals, round to the nearest hundredths
place (ex: 9.37)
1. Alpha is the probability of committing a Type I Error if…
a. The null distribution is true
b. The null distribution is false
c. n is larger than 30
d. the alternative distribution is true
2. We are more likely to reject the null as…
a. Alpha goes down
b. n goes down
c. variation goes down
d. the difference between...

1.The sample mean is an unbiased estimator for
the population mean. This means:
The sample mean always equals the population mean.
The average sample mean, over all possible samples, equals the
population mean.
The sample mean will only vary a little from the population
mean.
The sample mean has a normal distribution.
2.Which of the following statements is
CORRECTabout the sampling distribution of the
sample mean:
The standard error of the sample mean will decrease as the
sample size increases....

QUESTION 1
? What is the relationship between family dysfunction and
schizophrenia?
a.
?Research has substantiated a link between family dysfunction
and schizophrenia but can't say which causes the other.
b.
?Family dysfunction is a major causative factor for
schizophrenia.
c.
?Research has failed to substantiate a direct causal link
between family dysfunction and schizophrenia.
d.
?Family dysfunction plays a minor role in developing
schizophrenia.
1.00000 points
QUESTION 2
? Chuck has no life plan; he simply lives from...

Please answer the following Case
analysis questions
1-How is New Balance performing compared to its primary rivals?
How will the acquisition of Reebok by Adidas impact the structure
of the athletic shoe industry? Is this likely to be favorable or
unfavorable for New Balance?
2- What issues does New Balance management need to address?
3-What recommendations would you make to New Balance Management?
What does New Balance need to do to continue to be successful?
Should management continue to invest...

What tools could AA leaders have used to increase their
awareness of internal and external issues?
???ALASKA AIRLINES: NAVIGATING CHANGE
In the autumn of 2007, Alaska Airlines executives adjourned at
the end of a long and stressful day in the
midst of a multi-day strategic planning session. Most headed
outside to relax, unwind and enjoy a bonfire
on the shore of Semiahmoo Spit, outside the meeting venue in
Blaine, a seaport town in northwest
Washington state.
Meanwhile, several members of...

What role could the governance of ethics have played
if it had been in existence in the organization? Assess the
leadership of Enron from an ethical perspective.
THE FALL OF ENRON: A STAKEHOLDER FAILURE
Once upon a time, there was a gleaming headquarters
office tower in Houston, with a giant tilted "£"' in front, slowly
revolving in the Texas sun. The Enron Corporation, which once
ranked among the top Fortune 500 companies, collapsed in 2001 under
a mountain of debt...

Discuss ethical issues that can be identified in this
case and the mode of managing ethics Enron finds itself in this
case. How would you describe the ethical culture and levels of
trust at Enron? Provide reasons for your assessment.
THE FALL OF ENRON: A STAKEHOLDER FAILURE
Once upon a time, there was a gleaming headquarters
office tower in Houston, with a giant tilted "£"' in front, slowly
revolving in the Texas sun. The Enron Corporation, which once
ranked among...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 8 minutes ago

asked 13 minutes ago

asked 19 minutes ago

asked 21 minutes ago

asked 28 minutes ago

asked 29 minutes ago

asked 29 minutes ago

asked 41 minutes ago

asked 42 minutes ago

asked 52 minutes ago

asked 55 minutes ago

asked 59 minutes ago