Question

An entrepreneur is considering the purchase of a coin-operated
laundry. The current owner claims that over the past 5 years, the
mean daily revenue(μ) was $725 with a population standard deviation
(σ ) of $125. A sample of 30 days (n) reveals a daily mean revenue
of $750 (sample mean; X bar). If you were to test the alternate
hypothesis that the daily mean revenue is ** not equal
to** $725 and assume that the level of significance(α
=0.1), please answer the following questions (20 points)

- State your null and alternate hypotheses :

- What is the value of test statistic? Please show all the relevant calculations.

- What are the rejection criteria based on critical value approach?

- What is the Statistical decision (i.e. reject /or do not reject the null

hypothesis)? Provide justification for your decision.

Answer #1

4. An entrepreneur is considering the purchase of a
coin-operated laundry. The present owner claims that over the past
5 years, the average daily revenue is $675 with a standard
deviation of $75. The potential purchaser is interested in whether
or not the average daily revenue differs from $675. A random sample
of 25 days reveals an average daily revenue of $625. At the 5%
level of significance, what should the potential buyer do?

Are the motivation scores of Japanese managers different from
those of American managers? A randomly selected group of each were
administered the Sarnoff Survey of Attitudes Toward Life (SSATL),
which measures motivation for upward mobility. The SSATL scores are
summarized below.
Japanese
American
Sample Size
10 (n1)
10 (n2)
Sample Mean SSATL Score
65(X1bar)
85(X2bar)
Sample Std. Dev.
20(s1)
20(s2)
The goal of the study is to determine if the population mean
SSATL score for the Japanese is different
from...

) A manufacturer of sprinkler systems designed for fire
protection claims that the average activating temperature is at
least 135℉ . To test this claim, you randomly select a
sample of 32 systems and find that the mean activation temperature
is 133℉ . Assume that the population standard deviation is
3.3℉ . At α=0.05, do we have enough evidence to
reject the manufacturer’s claim? (Please write your answers in
complete sentences.)
Identify the claim and state the Null and Alternate...

The dean of a college is interested in the proportion of
graduates from his college who have a job offer on graduation day.
He is particularly interested in seeing if there is a
difference in this proportion for accounting and
economics majors. In a random sample of 200 of each type of major
at graduation, he found that 70 accounting majors and 60 economics
majors had job offers. Assume pooled estimate of the population
proportion and a level of significance...

An employment information service claims the mean annual pay
for full-time male workers over age 25 without a high school
diploma is $22,300.The annual pay for a random sample of 10
full-time male workers over age 25 without a high school diploma
is listed. At α=0.10, test the claim that the mean salary is
$22,300. Assume the population is normally distributed.
20,651 21,135 22,350 21,396 22,974 16,916 19,150 23,190 24,189
26,286
(a) Write the claim mathematically and identify Ho and...

Please show all work:
Assignment: You will be answering problems #1 - #4. For each
problem, you will need to complete parts A through F. Please make
sure you answer each part completely and you offer justification
where necessary. Do all work "by hand" (not using StatCrunch) as
good practice for your next exam!
A) Write the claim mathematically and state the null and
alternative hypotheses.
B) Determine whether the hypothesis test is left-tailed,
right-tailed, or two tailed and whether...

answer all these questions please with the right question number
next to its letter
1-When the population standard deviation is unknown
AND the sample size is less than 30, the test
statistic to use is:
A
t
B
The Binomial Dristribution
C
The Z Distribution
D
Chi-Square
4-What do we call the statement (rule you create) that
determines if the null hypothesis is rejected?
A
Decision rule
B
Test statistic
C
Alternate hypothesis
D
Critical mass
8-
The mean length...

A coffee manufacturer is interested in the coffee drinking
habits of Regular and Decaffeinated
coffee drinkers. A random sample of 50 regular-coffee drinkers
showed a mean of 4.35 cups per day. A sample of 40
decaffeinated-coffee drinkers showed a mean of 5.84 cups per day.
Assume the population standard deviation for those drinking regular
coffee is 1.2 cups per day and 1.36 cups per day for those drinking
decaffeinated coffee. At the .01 significance level can we conclude
that the...

Question 5: Assume that you make candy bars; the advertised
weight of the candy bar is 4.0 ounces with a standard deviation
(sigma) of 2.35 oz. however your production manager thinks that
this is not true; he thinks the candy bars are over-weight, they
weigh more than 4.0 oz. To test his claim, you
decided to randomly select a sample of 126 candy bars, the average
weight (x-bar) is 4.5 oz. At an alpha (a) of 0.01 what do you...

PLEASE URGENT
The restaurant owner Lobster Jack wants to find out what the
peak demand periods are, during the hours of operation, in order to
be better prepared to serve his customers. He thinks that, on
average, 60% of the daily customers come between 6:00pm and 8:59pm
(equally distributed in that time) and the remaining 40% of
customers come at other times during the operating hours (again
equally distributed). He wants to verify if that is true or not, so...

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