Question

A researching team conduct a survey, where out of 76 Americans surveyed, only 2 had seen or sensed the presence of an angel. Test the claim that 13% of Americans have seen or sensed the presence of an angel. Use α = 0.05

Answer #1

Z is the standard normal variate.

P(Z>2.6877) is calculated using standard normal table.

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1. The average work week for engineers in a start-up company
is believed to be about 60 hours. A newly hired engineer hopes that
it’s shorter. She asks 10 engineering friends in start-ups for the
lengths of their average work weeks. Based on the results that
follow, should she count on the
average work week to be shorter than 60 hours?
Data (length of average work week): 70; 45; 55; 60; 65;...

A poll done for an organization found that 13% of Americans have
seen or sensed the presence of an angel. A contingent doubts that
the percent is really that high. It conducts its own survey. Out of
78 Americans surveyed, only two had seen or sensed the presence of
an angel. As a result of the contingent's survey, would you agree
with the organization's poll? Conduct a hypothesis test at the 5%
level.
Note: If you are using a Student's...

In a survey on supernatural experiences, 724 of 4003 adult
Americans surveyed reported that they had seen or been with a
ghost.
(a) What assumption must be made in order for it to be
appropriate to use the formula of this section to construct a
confidence interval to estimate the proportion of all adult
Americans who have seen or been with a ghost?
We need to assume that there are only 724 adult Americans.We
need to assume that the 4003...

1.Simplify (n+1)! / (n-1)!
2..A survey found that 10% of Americans believe that they have
seen a UFO. For a sample of 10 people, find the probability that
exactly 5 people believe that they have seen a UFO. Use Table B or
the binomial probability formula.

out of a sample of 1031 Americans surveyed, 912 of them own a
television
a) is there a significant evidence at a=0.05 to conclude the
majority of Americans (>50%) own a television?
i) verify the normality condition necessary for the hypothesis
testing.
ii) step 1: Ho:________ H1: ______________
iii) step 2: a=________
iv) step 3: calculate test statistic:
v) now, use your calculator to find the p-value.
vi) are you going to reject or fail to reject the hypothesis
claim?...

5. A survey conducted at a Midwestern university and involving
1,500 students found that 68% had
taken out a student loan to help pay for the cost of their
college education. A similar study at a
southeastern university in which 2,000 students were surveyed
found that 47% had taken out a student
loan.
a.Develop and interpret a 95% confidence interval estimate for
the difference in the proportions of
students who have loans at these two universities.
b.Using an alpha level...

1) In a survey conducted by a website, employers were asked if
they had ever sent an employee home because they were dressed
inappropriately. A total of 2761 employers responded to the survey,
with 974 saying that they had sent an employee home for
inappropriate attire. In a press release, the website makes the
claim that more than one-third of employers have sent an employee
home to change clothes.
Do the sample data provide convincing evidence in support of this...

A research team is hired to investigate the prevalence of
periodontal disease in a rural county with a low average
socio-economic status. The team is given the task of surveying the
area, and providing a brief examination of participants to
correctly identify cases of periodontal disease and estimate an
overall prevalence. If the team identifies an overall prevalence of
above 25%, the sponsoring organization is to initiate an active
campaign promoting healthy dental practice. Out of 150 participants
surveyed, 30...

A recent article in the Daily Express newspaper reported that
only one in four new college graduates are able to obtain a job.
The reason stated is that there is an overabundance of college
graduates and a recession.
A survey of 150 college graduates revealed that 47 had jobs.
Using a significance level of α=0.01, conduct a hypothesis test to
examine if a larger proportion of college graduates have jobs than
the newspapers claim.
(2 decimal places)
1- State the...

In a survey conducted by a website, employers were asked if they
had ever sent an employee home because they were dressed
inappropriately. A total of 2756 employers responded to the survey,
with 963 saying that they had sent an employee home for
inappropriate attire. In a press release, the website makes the
claim that more than one-third of employers have sent an employee
home to change clothes.
Do the sample data provide convincing evidence in support of this
claim?...

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