Question

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 < ?

Answer #1

A community college course in economics requires that students
must write two tests. 75% of students pass the first test (A) and
65% pass the second test (B). 55% pass both tests. What is the
probability that a randomly selected student will pass exactly one
of the two tests? What is the probability that a random student
selected will pass the second test (B) if it is known they passed
the first test (A)?

According to a recent study, 75 out of 100 randomly selected
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it.

Fifteen out of the 145 randomly selected study-abroad students
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Construct and interpret a 98% confidence interval for the
proportion of all study-abroad students in the state who can speak
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Throughout the country, the proportion of first-time, first-year
community college students who return for their second year of
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this policy was in place there were n = 2843 first-time, first-year
students (N = 1, 050,000). Of these students, x = 1516 returned for
their second year of studies. Treat these students...

Community college students survey students at their college and
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Of the 25 randomly selected students, 17 have met with a
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(Answers may vary slightly due to rounding. Round SE to 2
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We have found that students who study by giving themselves
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the question of interest is not ‘‘Is there an effect?” but instead
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information given below to find a 90% confidence interval for the
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when 294 college students are randomly selected and surveyed, it
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work!!

75% of students at a College receive financial aid. We surveyed
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a) Find the mean and standard deviation for the number of
students in the survey that receive financial aid using the
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b) Use binomcdf to determine the probability that at least 81 of
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c) Approximate the Binomial with the Normal by using normalcdf
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The mean age of all students at a local community college for a
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been pretty consistent at 12. Suppose that 25 students from the
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29.7. The true mean age of the community college students, given a
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[y]. Please enter the lower limit of
the interval first and the upper limit second. Please...

A study used 1259 patients who had suffered a stroke. The study
randomly assigned each subject to an aspirin treatment or a placebo
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