Question

HW 9

Assume that a 90% confidence interval for a population proportion has lower bound = 0.24 and upper bound = 0.34.

*The sample proportion based on the collected data is [ Select ] ["0.29", "unknown", "0.34", "0.24"]

*The margin of error is [ Select ] ["0.025", "0.010", "0.05", "0.10"]

*α/2α/2 for this confidence interval is [ Select ] ["0.005", "0.001", "0.05", "0.025"]

Answer #1

Sol:

sample proprtion-margin of error=0.24--->(1)

sample proportion+margin of error=0.34 ----->(2)

add 2 equations

2p^=0.24+0.34

p^=0.29

*The sample proportion based on the collected data is 0.29

substitute sample proportion in (2) to get margin of error

margin of error=0.34 -sample proprtion

=0.34-0.29

=0.05

The margin of error is 0.05

alpha/2=0.10/2=0.05

The sample proportion based on the collected data is 0.29

The margin of error is 0.05

alpha/2=0.05

Construct a confidence interval of the population proportion at
the given level of confidence. x equals 160, n equals 200, 90 %
confidence
The lower bound is ____. The upper bound is ____.

Construct a confidence interval of the population proportion at
the given level of confidence. x=160, n =200, 90 % confidence The
lower bound is ____. The upper bound is ____.

Construct a 90% confidence interval of the population
proportion using the given information. x=40, n=200
The lower bound is?
The upper bound is?
(round to three decimal places as needed)

Construct a 90% confidence interval of the population
proportion using the given information. x=120, n=300
The lower bound is____
The upper bound is_____
(Round to three decimal places as needed.)

Construct a 90% confidence interval of the population
proportion using the given information. x equals 240 comma n equals
300 The lower bound is nothing. The upper bound is nothing. (Round
to three decimal places as needed.)

Determine the point estimate of the population proportion,the
margin of error for the following confidence interval,and the
number of individuals in the sample with the specified
characteristic, x, for the sample size provided. Lower bound=0.691,
upper bound=0.891, n=1000. The number of individuals in the sample
with the specified characteristic is? Round to the nearest integer
as needed

Determine the point estimate of the population proportion, the
margin of error for the following confidence interval, and the
number of individuals in the sample with the
specifiedcharacteristic, x, for the sample size provided.
Lower bound=0.507,
upper bound=0.903,
n=1000
The margin of error is _____.

Construct a 90% confidence interval to estimate the population
proportion with a sample proportion equal to 0.50 and a sample size
equal to 150. What are the upper and lower limits?

Determine the point estimate of the population mean and margin
of error for the confidence interval. Lower bound is 20?, upper
bound is 30. The point estimate of the population mean is _____.
The margin of error for the confidence interval is _____.

Construct a confidence interval of the population proportion at the
given level of confidence.
x= 860, n= 1200, 98% confidence
What is the lower bound of the confidence interval?
What is the upper bound of the confidence interval?

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