Question

Fifteen out of the 145 randomly selected study-abroad students who were surveyed in a state can speak the French language. Construct and interpret a 98% confidence interval for the proportion of all study-abroad students in the state who can speak French.

Answer #1

when 294 college students are randomly selected and surveyed, it
is found that 130 own a car. Find a 90% confidence interval for the
proportion of all college students who own a car. Show all
work!!

Gallup poll consisted of 1012 randomly selected adults who were
asked whether or not cloning of humans should be allowed. 901 of
the adults surveyed said that cloning should not be allowed.
Construct a 98% confidence interval to estimate the true percentage
of all adults who hold this belief. 1. State the Parameter 2. Find
the point estimate 3. Check assumptions 4.Find the critical value
5. Find the margin of error 6. Find the confidence interval
limits

When 500 college students were surveyed, 30% said that they own
their car. Construct a 98% confidence interval for the proportion
of college students who say they own their cars. Please show work
each step of the process.

A recent study of 2500 children randomly selected found 24% of
them were deficient in vitamin D.
a. Construct the 98% confidence interval for the true
proportion of children who are deficient in vitamin D. (round to 3
decimal places)
b. Exlplain carefully what the interval means?
A. We are 98% confident that the percent of people deficient in
vitamin D is 24%
B. We are 98% confident that the percent of children deficient
in vitamin D is 24%
C....

A study at a community college shows that, of the 75 randomly
selected first year students, 23 experienced stress. Of the 81
randomly selected second year students, 38 experienced stress. (Let
p1 be the proportion of first year students experienced stress and
p2 the proportion of second year students experienced
stress).
Find a 98% confidence interval for the difference in proportions.
Round answers to two decimal places.
? < p1−p2 < ?

1. Of the 400 customers who were randomly surveyed, 110 believed
that air polution was not a problem.
i. Calculate a 99% confidence interval for the true proportion
of all American that believe that air polution is not a problem.
Show workings pls
ii. Provide a plain language interpretation of the interval you
constructed in part i.
iii. In part i, we have used a confidence level of 99%. What
does the confidence level mean? Do we always use 99%?...

About 77% of MCC students believe they can achieve the American
dream and about 64% of Ferris State Universtiy students believe
they can achieve the American dream. Construct a 99% confidence
interval for the difference in the proportions of Montcalm
Community College students and Ferris State University students who
believe they can achieve the American dream.
There were 100 MCC students surveyed and 100 FSU students
surveyed.
a. With 99% confidence the difference in the proportions of MCC
and FSU...

16 students were randomly selected from a large group of
students taking a certain calculus test. The mean score for the
students in the sample was 86 and the standard deviation was 1.3.
Assume that the scores are normally distributed. Construct a 98%
confidence interval for the mean score, μ, of all students taking
the test. Round your answer to two decimal places.

In a study of 1314 randomly selected medical malpractice
lawsuits, it was found that 1023 were dropped or dismissed.
?) Construct a 95% confidence interval for the
proportion of all medical malpractice lawsuits that are dropped or
dismissed.
?) It is claimed that the true proportion of
all medical malpractice lawsuits that are dropped or dismissed is
0.80.
Does your result from part ? support this
claim?

thirty-one randomly selected students scores on the test in MTH
243 were recorded. This sample had a mean of 73 and a standard
deviation of 8.4. Construct a 98% confidence interval for the mean
score of all students MTH 243 test score. (round all values to
three decimal places)
Does this sample satisfy the conditions for constructing a
confidence interval?
Select an answer Yes No Why do you keep asking these questions of
me?
What critical value is appropriate for...

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