Question

In 2007, 369 out of a sample of 900 eighth-graders in Atlanta scored at or above the Basic level in mathematics. In large public city, 57% scored at or above the Basic level in mathematics in 2007. (A) Construct a 95% confidence interval estimate for the proportion of eighth-graders who scored at or above the Basic level in Atlanta. What do you conclude? (B) In 2011, 702 out of a sample of 1300 eighth-graders in Atlanta scored at or above the Basic level in mathematics. Construct a 95% confidence interval estimate for the difference in the proportions of eighthgraders who scored at or above the Basic level in Atlanta for the years 2007 and 2011. What do you conclude?

Answer #1

Suppose a sample of 991991 tenth graders is drawn. Of the
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population proportion of tenth graders reading at or below the
eighth grade level. Round your answers to three decimal places.

Use the above sample information and construct two confidence
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4.1 A recent
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Confidence
Interval
Confidence Level
Z - Limits
90%
± 1.645
95%
±1.96
99%
±2.58

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community and found out that 50 of them disagreed with a new
construction project.
a) Use this sample to find the 95 % confidence interval estimate
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using point estimate and margin of error.
b) At 5% level of significance, test to see the percentage of
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A research institute poll asked respondents if they felt
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said "yes." Use a 95 % confidence level.
a) Find the best point estimate of the population proportion p.
_____ (Round to three decimal places as needed.)
b) Identify the value of the margin of error E. E=_____(Round
to three decimal places as needed.)
c)...

Use the sample data and confidence level given below to complete
parts (a) through (d).
A research institute poll asked respondents if they felt
vulnerable to identity theft. In the poll, n equals =1091 and x
equals =501 who said "yes". Use a
95 % confidence level.
a) Find the best point estimate of the population proportion
p.
Population proportion = ?
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E.
E= ?...

Use the sample data and confidence level given below to complete
parts (a) through (d).
A research institute poll asked respondents if they felt
vulnerable to identity theft. In the poll,
n=991
and
x=592
who said "yes." Use a
95%
confidence level.
a) Find the best point estimate of the population proportion
p.
nothing
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E.
E=nothing
(Round to three decimal places as needed.)
c)...

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b. Construct and interpret the...

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parts? (a) through? (d). A research institute poll asked
respondents if they felt vulnerable to identity theft. In the?
poll, n equals 1070 and x equals 572 who said? "yes." Use a 95 %
confidence level. LOADING... Click the icon to view a table of z
scores. ?a) Find the best point estimate of the population
proportion p. nothing ?(Round to three decimal places as? needed.)
?b) Identify the...

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parts (a) through (d). A research institute poll asked
respondents if they felt vulnerable to identity theft. In the
poll, n equals 1072 and x equals 527 who said "yes." Use a 95 %
confidence level.
a) Find the best point estimate of the population proportion p.
nothing (Round to three decimal places as needed.)
b) Identify the value of the margin of error E. Eequals nothing
(Round...

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