In a sample of 410 adults, 246 had children. Construct a 90%
confidence interval for the true population proportion of adults
with children.
Give your answers as decimals, to three places
_______ < p < _______
In a sample of 210 adults, 195 had children. Construct a 90%
confidence interval for the true population proportion of adults
with children.
Give your answers as decimals, to three places
<p<
In a sample of 270 adults, 216 had children. Construct a 99%
confidence interval for the true population proportion of adults
with children. Give your answers as decimals, to three places
1) In a sample of 160 adults, 147 had children. Construct a 99%
confidence interval for the true population proportion of adults
with children.
Give your answers as decimals, to three places
< p <
2)
You want to obtain a sample to estimate a population proportion.
Based on previous evidence, you believe the population proportion
is approximately p∗=35%p∗=35%. You would like to be 98% confident
that your esimate is within 2.5% of the true population proportion.
How large of...
A sociologist wants to construct a 90% confidence interval for
the proportion of children aged 8-10 living in New York who own a
cell phone. A survey by the National Consumers League taken in 2012
estimates the nationwide proportion to be 0.41. Using this
estimate, what sample size is needed so that the confidence
interval will have a margin of error of 0.02?
In each case, find the approximate sample size required to
construct a 90% confidence interval for p that has sampling error
SE=0.07. a. Assume that p is near 0.4. b. Assume that you have no
prior knowledge about p, but you wish to be certain that your
sample is large enough to achieve the specified accuracy for the
estimate.
a. The approximate sample size is _____
b. The approximate sample size is _____
Determine an approximate sample size required to construct a 90%
confidence interval for the mean number of miles on four-year -old
Honda Civics, with a margin of error of 1000 miles. Assume that a
preliminary study showed that the standard deviation is estimated
to be 19,700 miles.
A random sample of 32 washing machines had a mean replacement
time of 10.6 years and a population standard deviation of 2.1
years. Find the margin of error that corresponds to 99% confidence...
Determine the sample size n needed to construct a 90%
confidence interval to estimate the population mean when sigma
equals 67 and the margin of error equals 10.
n=???????
Determine the sample size n needed to construct a 90%
confidence interval to estimate the population proportion when p
over bar equals 0.64 and the margin of error equals 7%.
n=???
Construct a 90% confidence interval of the mean birth weight of
195 boys with sample mean =32.7 hg , and standard deviation =6.6
hg.
Group of answer choices
a) 1.645<mean<1.777
b) 31.923<mean<33.477
c) 32%<mean<33%
d) 0.777<mean<1