Question

(1 point) Dylan wants to determine a 99 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must he have to get a margin of error less than 0.02? [To find n, use the value p* = 1/2 for the sample proportion and the values for z* from a z-table or t-table.] [Round to the smallest integer that works.] n =

Answer #1

answer = 4161.

Dylan wants to determine a 95 percent confidence interval for
the true proportion of high school students in the area who attend
their home basketball games. How large of a sample must he have to
get a margin of error less than 0.02? [To find n, use the value p*
= 1/2 for the sample proportion and the values for z* from a
z-table or t-table.]
[Round to the smallest integer that works.] n =

1) Kim wants to determine a 99 percent confidence interval for
the true proportion p of high school students in the area who
attend their home basketball games. Out of n randomly selected
students she finds that that exactly half attend their home
basketball games. About how large would ? have to be to get a
margin of error less than 0.01 for p?
[Use the values for z* from a z-table or t-table, and round to the
smallest integer...

HW 25 #7
Cora wants to determine a 80 percent confidence interval for the
true proportion of high school students in the area who attend
their home basketball games. How large of a sample must she have to
get a margin of error less than 0.02? Assume we have no prior
estimate of the proportion and want a conservative choice for the
sample size.
[Round to the smallest integer that works.] n =

Kim wants to determine a 90 percent confidence interval for the
true proportion of high school students in the area who attend
their home basketball games. How large of a sample must she have to
get a margin of error less than 0.03?
HINT: To find n, since no previous study has been done, use the
value p = 0.5 for the proportion and one of the values (1.282,
1.645, 1.96, 2.576) for the critical value depending on the
confidence...

How's the economy? A pollster wants to construct a 95 %
confidence interval for the proportion of adults who believe that
economic conditions are getting better.
(a) A poll taken in July 2010 estimates this 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 ?
(b) Estimate the sample size needed if no estimate of p is
available. Part 1 of 2
(a)...

A researcher wants to construct a 95% confidence interval for
the proportion of elementary school students in Seward County who
receive free or reduced-price school lunches. What sample size is
needed so that the confidence interval will have a margin of error
of 0.03?

The principal of a large local high school wants to know what
proportion of her students are planning to attend college. Suppose
that 72% of all students in her high school are planning to attend
college. What is the probability that an SRS of size 200 will give
a sample proportion between 66% and 78%?
0.939
0.061
0.099
0.815

A survey is planned to determine what proportion of high-school
students in a metropolitan school system have regularly smoked
marijuana. The school administrators would like to estimate the
proportion with 95 % confidence and a margin of error of no more
than 4%.
It was reported that 31.03% of high school students in a
similar metropolitan area regularly smoke marijuana. If this
estimate is used, what sample size would be required? n =
If the administrators choose not to use...

1. When constructing a confidence interval to estimate a
population proportion, what affects the size of the margin of
error?
A. The sample size
B. The sample proportion
C. The confidence level
D. All of the above affect the size of the margin of error
E. None of the above affect the size of the margin of error
2. What percentage of couples meet through online dating
apps? A survey of a random sample of couples finds that 12% say...

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

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