Question

A fashion designer wants to know how many new dresses women buy each year. Assume a previous study found the variance to be 4. She thinks the mean is 7 dresses per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.11 at the 90% level of confidence? Round your answer up to the next integer.

Answer #1

A fashion designer wants to know how many new dresses women buy
each year. Assume a previous study found the standard deviation to
be 1.4. She thinks the mean is 7.3 dresses per year. What is the
minimum sample size required to ensure that the estimate has an
error of at most 0.13 at the 90% level of confidence? Round your
answer up to the next integer.

A fashion designer wants to know how many new dresses women buy
each year. She thinks the mean is 6.6 dresses per year. Assume a
previous study found the variance to be 4. How large of a sample
would be required in order to estimate the mean number of dresses
bought per woman at the 98% confidence level with an error of at
most 0.09 dresses?

A toy manufacturer wants to know how many new toys children buy
each year. Assume a previous study found the
variance to be 3.61. She thinks the mean is 9.3
toys per year. What is the minimum sample size required to ensure
that the estimate has an error of at most 0.12 at the 90% level of
confidence? Round your answer up to the next
integer.

A toy manufacturer wants to know how many new toys children buy
each year. Assume a previous study found the standard deviation to
be 1.5. She thinks the mean is 6.9 toys per year. What is the
minimum sample size required to ensure that the estimate has an
error of at most 0.1 at the 80% level of confidence? Round your
answer up to the next integer.

A toy manufacturer wants to know how many new toys children buy
each year. Assume a previous study found the standard deviation to
be 1.5. She thinks the mean is 7.2 toys per year. What is the
minimum sample size required to ensure that the estimate has an
error of at most 0.1 at the 98% level of confidence?

Suppose that a company would like a 0.95 probability that the
sample proportion of all adults who would never give personal data
to a company is within 0.1 of the population proportion.
How large a sample size is needed to meet the required
precision? Assume that the previous sample of similar units yielded
0.2 for the sample proportion.
a.
6.14
b.
31.36
c.
61.4
A fashion designer would like to know how many new dresses women
buy each year. She...

An educational psychologist wishes to know the mean number of
words a third grader can read per minute. She wants to ensure that
the estimate has an error of at most 0.19 words per minute. A
previous study found that the mean was 28.3 words per minute.
Assuming that the variance is 29.16, what is the minimum number of
third graders that must be included in a sample to construct the
98% confidence interval? Round your answer up to the...

An educational psychologist wishes to know the mean number of
words a third grader can read per minute. She wants to ensure that
the estimate has an error of at most 0.230.23 words per minute. A
previous study found that the mean was 29.829.8 words per minute.
Assuming that the variance is 23.0423.04, what is the minimum
number of third graders that must be included in a sample to
construct the 95%95% confidence interval? Round your answer up to
the...

An educational psychologist wishes to know the mean number of
words a third grader can read per minute. She wants to ensure that
the estimate has an error of at most 0.31 words per minute. A
previous study found that the mean was 28.7 words per minute.
Assuming that the variance is 6.76, what is the minimum number of
third graders that must be included in a sample to construct the
85% confidence interval? Round your answer up to the...

An educational psychologist wishes to know the mean number of
words a third grader can read per minute. She wants to ensure that
the estimate has an error of at most 0.3 words per minute. A
previous study found that the mean was 28.6 words per minute.
Assuming that the standard deviation is 4.3, what is the minimum
number of third graders that must be included in a sample to
construct the 98% confidence interval? Round your answer up to...

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