Question

Q6 **a)** A population standard
deviation is estimated to be 15. We want to estimate the population
mean within 1.2, with a 95-percent level of confidence. What sample
size is required?

**b)** Orla is the new statistician at a cola company.
She wants to estimate the proportion of the population who enjoy
their latest idea for a flavour enough to make it a successful
product. Orla wants to obtain a 95-percent confidence level
estimate of the population proportion and she wants the estimate to
be within 0.07 of the true proportion. how large a sample is
required?

**c)** A quick preliminary estimate of the proportion
obtained by her predecessor was 0.33. Knowing this, how large a
sample is required?

please show working step by step

Answer #1

A population is estimated to have a standard deviation of 9. We
want to estimate the population mean within 3, with a 95% level of
confidence
How large a sample is required?

You want to obtain a sample to estimate a population proportion.
At this point in time, you have no reasonable preliminary
estimation for the population proportion. You would like to be 95%
confident that you estimate is within 1.5% of the true population
proportion. How large of a sample size is required?
n =

You want to obtain a sample to estimate a population proportion.
At this point in time, you have no reasonable preliminary
estimation for the population proportion. You would like to be 80%
confident that you estimate is within 2% of the true population
proportion. How large of a sample size is required?

Let's say we want to estimate the population proportion of a
population. A simple random sample of size 400 is taken from the
population. If the sample proportion is 0.32:
1) what is the point estimate of the population proportion?
2) At the 95% level of confidence, what is the margin of
error?
3) Based on 2) what is a confidence interval at the 95%
confidence level?
4) What is the margin of error if the level of confidence is...

You want to obtain a sample to estimate a population proportion.
At this point in time, you have no reasonable preliminary
estimation for the population proportion. You would like to be 95%
confident that you estimate is within 4.5% of the true population
proportion. How large of a sample size is required?
The last person who answered this question did not give
me the correct answer nor instructions on how to find the different
values. Can someone please walk me...

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
<...

You want to obtain a sample to estimate a population proportion.
Based on previous evidence, you believe the population proportion
is approximately 34%. You would like to be 95% confident that your
estimate is within 4% of the true population proportion. How large
of a sample size is required?
n =

We want to estimate the population mean within 16, with a 90%
level of confidence. The population standard deviation is estimated
to be 45. How large a sample is required? (Round the intermediate
calculation to 2 decimal places. Round the final answer to the
nearest whole number.)
Sample size

We want to estimate the population mean within 4, with a 80%
level of confidence. The population standard deviation is estimated
to be 9. How large a sample is required? (Round the intermediate
calculation to 2 decimal places. Round the final answer to the
nearest whole number.) Sample size

You wish to estimate, with 95% confidence, the population
proportion of tablet owners who use their tablets daily. Your
estimate must be accurate within 2% of the population proportion.
No preliminary estimate is available. Find the minimum sample size
needed.

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