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Problem Page A researcher wants to estimate the proportion of depressed individuals taking a new anti-depressant drug who find relief. A random sample of 250 individuals who had been taking the drug is questioned; 207 of them found relief from depression. Based upon this, compute a 90 % confidence interval for the proportion of all depressed individuals taking the drug who find relief. Then complete the table below.

Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. (If necessary, consult a list of formulas.)

What is the lower limit of the 90 % confidence interval?

What is the upper limit of the 90 % confidence interval?

Answer #1

A researcher wants to estimate the proportion of depressed
individuals taking a new anti-depressant drug who find relief. A
random sample of 250 individuals who had been taking the drug is
questioned; 180 of them found relief from depression. Based upon
this, compute a 95% confidence interval for the proportion of all
depressed individuals taking the drug who find relief. Then
complete the table below. Carry your intermediate computations to
at least three decimal places. Round your answers to two...

A random sample of 200 individuals working in a large city
indicated that 58 are dissatisfied with their working conditions.
Based upon this, compute a 90% confidence interval for the
proportion of all individuals in this city who are dissatisfied
with their working conditions. Then complete the table below. Carry
your intermediate computations to at least three decimal places.
Round your answers to two decimal places. (If necessary, consult a
list of formulas.)
What is the lower limit of the...

A researcher wishes to estimate the proportion of x-rays
machines that malfunction. A random sample of 275 machines is
taken, and 88 of the machines in the sample malfunction. Based upon
this, compute a 95% confidence interval for the proportion of all
x-ray machines that malfunction. Then complete the table below.
Carry your intermediate computations to at least three decimal
places. Round your answers to two decimal places. ( If necessary,
consult a list of formulas.)
What is the lower...

Problem Page A certain brokerage house wants to estimate the
mean daily return on a certain stock. A random sample of 14 days
yields the following return percentages: 0.89, -0.27, -2.76, 0.08,
2.29, 2.92, -0.21, -2.69, -2.46, 2.19, -1.58, 1.76, -1.77, 2.57 If
we assume that the returns are normally distributed, find a 95 %
confidence interval for the mean daily return on this stock. Then
complete the table below. Carry your intermediate computations to
at least three decimal places....

The manufacturer of a new antidepressant claims that,
among all people with depression who use the drug, the proportion p
of people who find relief from depression is at least 80%. A random
sample of 205 patients who use this new drug is selected, and 160
of them find relief from depression. Based on these data, can we
reject the manufacturer's claim at the 0.05 level of significance?
Perform a one-tailed test. Then fill in the table below. Carry your...

Problem Page Recorded here are the germination times (in days)
for eighteen randomly chosen seeds of a new type of bean: 19, 22,
20, 20, 10, 15, 11, 13, 20, 12, 17, 19, 18, 12, 22, 22, 17, 10
Assuming that germination times are normally distributed, find a 90
% confidence interval for the mean germination time for all beans
of this type. Then complete the table below. Carry your
intermediate computations to at least three decimal places. Round
your...

A psychologist wants to estimate the standard deviation of IQ
scores. It is widely believed that IQ scores follow a normal
distribution. Her random sample of 25 IQ scores has a mean of 97.4
and a standard deviation of 17.2. Find the 99% confidence interval
for the population standard deviation based on this sample. Then
complete the table below. Carry your intermediate computations to
at least three decimal places. Round your answers to at least two
decimal places. (If necessary,...

A psychologist wants to estimate the standard deviation of IQ
scores. It is widely believed that IQ scores follow a normal
distribution. Her random sample of
25
IQ scores has a mean of
99
and a standard deviation of
13.2
. Find the
99%
confidence interval for the population standard deviation based
on this sample. Then complete the table below.
Carry your intermediate computations to at least three decimal
places. Round your answers to at least two decimal places. (If...

The following data were randomly drawn from an approximately
normal population.
31, 32, 35, 37, 42, 44, 48
Based on these data, find a
90%
confidence interval for the population standard deviation. Then
complete the table below.
Carry your intermediate computations to at least three decimal
places. Round your answers to at least two decimal places. (If
necessary, consult a list of formulas.)
What is
the lower limit of the
90%
confidence interval?
What is
the upper limit of the...

Lifetimes of AAA batteries are approximately normally
distributed. A manufacturer wants to estimate the standard
deviation of the lifetime of the AAA batteries it produces. A
random sample of
21
AAA batteries produced by this manufacturer lasted a mean of
11
hours with a standard deviation of
1.7
hours. Find a
95%
confidence interval for the population standard deviation of the
lifetimes of AAA batteries produced by the manufacturer. Then
complete the table below.
Carry your intermediate computations to at...

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