Question

75% of students at a College receive financial aid. We surveyed 110 randomly selected students.

a) Find the mean and standard deviation for the number of students in the survey that receive financial aid using the Binomial model.

b) Use binomcdf to determine the probability that at least 81 of the 110 students in the survey receive financial aid.

c) Approximate the Binomial with the Normal by using normalcdf to estimate the same probability as in Question b.

Answer #1

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 < ?

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!!

In a study of government financial aid for college students, it
becomes necessary to estimate the percentage of full-time college
students who earn abachelor's degree in four years or less. Find
the sample size needed to estimate that percentage. Use a0.04
margin of error and use a confidence level of 90%.
Complete parts (a) through (c) below.
a. Assume that nothing is known about the
percentage to be estimated.
nequals=nothing
(Round up to the nearest integer.)
b. Assume prior studies...

In a study of government financial aid for college students, it
becomes necessary to estimate the percentage of full-time college
students who earn a bachelor's degree in four years or less. Find
the sample size needed to estimate that percentage. Use a 0.02
margin of error and use a confidence level of 90%. Complete parts
(a) through (c) below.
a. Assume that nothing is known about the percentage to be
estimated. n=______d up to the nearest integer.)
b. Assume prior...

In a study of government financial aid for college students, it
becomes necessary to estimate the percentage of full-time college
students who earn a bachelor's degree in four years or less. Find
the sample size needed to estimate that percentage. Use a 0.01
margin of error and use a confidence level of 95%. Complete parts
(a) through (c) below.
a. Assume that nothing is known about the percentage to be
estimated.
___ (Round up to the nearest integer.)
b. Assume...

A university dean states that the proportion of students who
receive some sort of financial aid has increased compared to 55% of
students who received financial aid over the last several years.
The dean randomly selects 200 students and finds that 118 of them
are receiving aid.
Form the hypothesis to test the dean’s statement.
Conduct this test and explain if you support the dean’s
statement using 5% significance level for this test.

Suppose that 56% of all college students are female and that we
randomly select 15 college students. a) What is the probability
that exactly 8 of the students will be female? b) What is the
probability that 10 or more of the students will be female? c) What
is the mean number μ of females in such randomly selected groups of
15 students? d) What is the standard deviation σ of the number of
females in such randomly selected groups...

A certain flight arrives on time 81 percent of the time. Suppose
122 flights are randomly selected. Use the normal approximation to
the binomial to approximate the probability that
(a) exactly 110 flights are on time.
(b) at least 110 flights are on time.
(c) fewer than 110 flights are on time.
(d) between 110 and 111, inclusive are on time.

In a study of government financial aid for college students, it
becomes necessary to estimate the percentage of full-time college
students who earn a bachelor's degree in four years or less. Find
the sample size needed to estimate that percentage. Use a 0.05
margin of error and use a confidence level of 90 %. Complete parts
(a) through (c) below.
a. Assume that nothing is known about the percentage to be
estimated. n = __ (Round up to the nearest...

In a study of government financial aid for college students, it
becomes necessary to estimate the percentage of full-time college
students who earn a bachelor's degree in four years or less. Find
the sample size needed to estimate that percentage. Use a 0.02
margin of error and use a confidence level of 99%. Complete parts
(a) through (c) below.
Assume that nothing is known about the percentage to be estimated.
nequals nothing (Round up to the nearest integer.)
a. n=...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 10 minutes ago

asked 12 minutes ago

asked 37 minutes ago

asked 48 minutes ago

asked 50 minutes ago

asked 54 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago