Question

In the planning stage, a sample proportion is estimated as pˆ = 90/150 = 0.60. Use this information to compute the minimum sample size n required to estimate p with 99% confidence if the desired margin of error E = 0.12. What happens to n if you decide to estimate p with 95% confidence? (You may find it useful to reference the z table. Round intermediate calculations to at least 4 decimal places and "z" value to 3 decimal places. Round up your answers to the nearest whole number.)

Confidence Level | N |

99% | |

95% |

Answer #1

In the planning stage, a sample proportion is estimated as pˆ =
30/50 = 0.60. Use this information to compute the minimum sample
size n required to estimate p with 95% confidence if the desired
margin of error E = 0.07. What happens to n if you decide to
estimate p with 90% confidence? (You may find it useful to
reference the z table. Round intermediate calculations to at least
4 decimal places and "z" value to 3 decimal places....

In the planning stage, a sample proportion is estimated as pˆ =
49/70 = 0.70. Use this information to compute the minimum sample
size n required to estimate p with 99% confidence if the desired
margin of error E = 0.15. What happens to n if you decide to
estimate p with 95% confidence? (You may find it useful to
reference the z table. Round intermediate calculations to at least
4 decimal places and "z" value to 3 decimal places....

13. In the planning stage, a sample proportion is estimated as
p^ = 36/60 = 0.60. Use this information to compute the minimum
sample size n required to estimate p with 95%
confidence if the desired margin of error E = 0.09. What
happens to n if you decide to estimate p with 90%
confidence?
(You may find it useful to reference the z table. Round
intermediate calculations to at least 4 decimal places and
"z" value to 3 decimal...

In the planning stage, a sample proportion is estimated as pˆp^
= 54/60 = 0.90. Use this information to compute the minimum sample
size n required to estimate p with 95% confidence
if the desired margin of error E = 0.09. What happens to
n if you decide to estimate p with 90%
confidence? Use Table 1. (Round intermediate calculations
to 4 decimal places and "z-value" to 3 decimal places.
Round up your answers to the nearest whole number.)
...

10. The lowest and highest observations in a population are 19
and 63, respectively. What is the minimum sample size n
required to estimate μ with 95% confidence if the desired
margin of error is E = 2.6? What happens to n if
you decide to estimate μ with 90% confidence?
(You may find it useful to reference the z table. Round
intermediate calculations to at least 4 decimal places and
"z" value to 3 decimal places. Round up your...

The lowest and highest observations in a population are 28 and
62, respectively. What is the minimum sample size n
required to estimate μ with 90% confidence if the desired
margin of error is E = 1.6? What happens to n if
you decide to estimate μ with 99% confidence? Use Table 1.
(Round intermediate calculations to 4 decimal places and
"z-value" to 3 decimal places. Round up your answers to
the nearest whole number.)
Confidence Level
n
...

Assume that population proportion is to be estimated from the
sample described. Use the sample results to approximate the margin
of error and 95% confidence interval.
n=560, p-0.65 Round to four decimal places as needed.

A1.) A population proportion is estimated to be 0.0283 < p
< 0.0373 at 95% confidence level. Using 4 decimal places for
zc find the least sample size required to
ensure this estimate.
N=
B1.) A population proportion is estimated to be within 0.0035 of
p^= 0.3832 at 99% confidence level. Using 4 decimal places for
zc, find the least sample size required to
ensure this estimate.
N=
A2.) A population proportion is estimated to be 0.0323 < p
<...

The lowest and highest observations in a population are 17 and
57, respectively. What is the minimum sample size n required to
estimate μ with 90% confidence if the desired margin of error is E
= 2.8? What happens to n if you decide to estimate μ with 95%
confidence?

Let the following sample of 8 observations be drawn from a
normal population with unknown mean and standard deviation: 16, 26,
20, 14, 23, 10, 12, 29. [You may find it useful to
reference the t table.]
a. Calculate the sample mean and the sample
standard deviation. (Round intermediate calculations to at
least 4 decimal places. Round "Sample mean" to 3 decimal places and
"Sample standard deviation" to 2 decimal places.)
b. Construct the 95% confidence interval for
the population...

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