Question

The *Centers for Disease Control* reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .35.

a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (to the
nearest whole number)? Use 95% confidence.

b. Assume that the study uses your sample size recommendation in
part (a) and finds 520 smokers. What is the point estimate of the
proportion of smokers in the population (to 4 decimals)?

c. What is the 95% confidence interval for the proportion of smokers in the population (to 4 decimals)?

Answer #1

( a )

n = 2185

( b )

P hat = 520 / 2185

= 0.2380

point estimate of the proportion of smokers in the population = 0.2380

( c )

95% confidence interval

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .35 :
A sample of 2185 is taken with a margin of error of .02 by using
95% confidence. The sample size recommendation of 2185 finds 520
smokers. A point estimate of the proportion...

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .33.
a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (to the
nearest whole number)? Use 95% confidence.
2124...

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .29.
a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (to the
nearest whole number)? Use 95% confidence.
b....

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .29.
a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (to the
nearest whole number)? Use 95% confidence.
b....

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .30.
a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (to the
nearest whole number)? Use 95% confidence.
b....

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .34.
a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (to the
nearest whole number)? Use 95% confidence.
b....

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .33.
a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (to the
nearest whole number)? Use 95% confidence.
b....

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
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proportion who smoke of .25.
a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (rounded
up to the next whole number)? Use 95%...

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .34.
a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (to the
nearest whole number)? Use 95% confidence.
b....

The Centers for Disease Control reported the percentage
of people 18 years of age and older who smoke (CDC website,
December 14, 2014). Suppose that a study designed to collect new
data on smokers and nonsmokers uses a preliminary estimate of the
proportion who smoke of .35.
a. How large a sample should be taken to estimate the proportion
of smokers in the population with a margin of error of .02 (to the
nearest whole number)? Use 95% confidence.
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