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 =

Beth 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. Out of ? randomly selected students
she finds that that exactly half attend their home basketball
games. About how large would ?nhave to be to get a margin of error
less than 0.01 for ??
[Use the values for z* from a z-table or t-table, and round to the
smallest integer that works.]...

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...

Reading proficiency: An educator wants to construct a 99%
confidence interval for the proportion
of elementary school children in Colorado who are proficient in
reading.
(b) Estimate the sample size needed if no estimate of P is
available.
A sample of __ elementary school children is needed to obtain a
99% confidence interval
with a margin of error of 0.03.

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...

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