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STAT 211 FINAL EXAM 2025| QUESTIONS AND
CORRECT ANSWERS | ALREADY GRADED A+ |
VERIFIED ANSWERS | LATEST VERSION
Which of these statements correctly interprets what it means to be "95%
confident"?
A. 95% of the sample is in the confidence interval.
B. 95% of samples will produce a confidence interval that captures the true
proportion.
C. 95% of the time, the sample proportion will be in the interval. - (ANSWER)B.
95% of samples will produce a confidence interval that captures the true
proportion.
A research company polled a random sample of
646 teens about Internet use 50% of those teens reported that they had
misrepresented their age online to gain access to websites and online services.
Explain the meaning of p^=0.50 in the context of this situation.
A. The meaning of p=0.50 is that the researchers have 95% confidence that 50%
of all U.S. teens would say that they have misrepresented their age online.
B. The meaning of p=0.50 is that the researchers have 95% confidence that 50% of
the 646 teens in the sample said they have misrepresented their age online.
C. The meaning of p=0.50 is that 50% of the 646 teens in the sample said they
have misrepresented their age online. This is the researchers' best estimate of p,
the proportion of all U.S. teens who would say they have done so.
D. The meaning of p=0.50 is that 50% of the 646 teens in the sample said they
have misrepresented their age online. This - (ANSWER)C. The meaning of p=0.50
is that 50% of the 646 teens in the sample said they have misrepresented their
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age online. This is the researchers' best estimate of p, the proportion of all U.S.
teens who would say they have done so.
A research company polled a random sample of
646 teens about Internet use 50% of those teens reported that they had
misrepresented their age online to gain access to websites and online services. SE
(P^) = .020 Explain what this standard error means in the context of this situation.
A. The standard error is the best estimate of the margin of error of the poll. The
researchers can be confident that the difference between p and p is not greater
than the standard error.
B. The standard error is the best estimate of the standard deviation of the
sampling distribution of the proportions, which measures the amount of variation
in the sample and population proportions.
C. The standard error is the best estimate of the standard deviation of the
sampling distribution of the proportions, which measures the amount of variation
in the sample proportion expected to be seen from sample to sample when 646
teens are asked the po - (ANSWER)C. The standard error is the best estimate of
the standard deviation of the sampling distribution of the proportions, which
measures the amount of variation in the sample proportion expected to be seen
from sample to sample when 646 teens are asked the polling question.
Reaching out 2 standard errors on either side of the sample proportion makes us
__________ confident that the true proportion is captured within the interval. -
(ANSWER)95%
Of 575 broiler chickens purchased from various kinds of food stores in different
regions of a country and tested for types of bacteria that cause food-borne
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illnesses, 36% were infected with a particular bacterium. 95% CI = 32.1% - 39.9%
What does the confidence interval say about chicken sold in the country?
A. There is a 95% chance that the true proportion of broiler chickens infected with
the bacterium is in the interval.
B. In 95% of samples of broiler chickens sold in the country, the proportion
infected with the bacterium will be in the interval.
C. We are 95% confident that the interval captures the true proportion of all
broiler chickens sold in the country that are infected with the bacterium. -
(ANSWER)C. We are 95% confident that the interval captures the true proportion
of all broiler chickens sold in the country that are infected with the bacterium.
Of 575 broiler chickens purchased from various kinds of food stores in different
regions of a country and tested for types of bacteria that cause food-borne
illnesses, 36% were infected with a particular bacterium. A government
spokesperson claimed that the sample size was too small, relative to the billions
of chickens slaughtered each year, to generalize. Is this criticism valid?
A. Yes, the sample size must be at least 10% of the population, or the results
cannot be generalized.
B. No, as long as the necessary assumptions and conditions were met, the results
can be generalized.
C. Yes, until another study produces a similar interval, the results cannot be
generalized. - (ANSWER)B. No, as long as the necessary assumptions and
conditions were met, the results can be generalized.
A polling company conducts an annual poll of adults about political opinions. The
survey asked a random sample of 473 adults whether they think things in the
country are going in the right direction or in the wrong direction 71% said that
STAT 211 FINAL EXAM 2025| QUESTIONS AND
CORRECT ANSWERS | ALREADY GRADED A+ |
VERIFIED ANSWERS | LATEST VERSION
Which of these statements correctly interprets what it means to be "95%
confident"?
A. 95% of the sample is in the confidence interval.
B. 95% of samples will produce a confidence interval that captures the true
proportion.
C. 95% of the time, the sample proportion will be in the interval. - (ANSWER)B.
95% of samples will produce a confidence interval that captures the true
proportion.
A research company polled a random sample of
646 teens about Internet use 50% of those teens reported that they had
misrepresented their age online to gain access to websites and online services.
Explain the meaning of p^=0.50 in the context of this situation.
A. The meaning of p=0.50 is that the researchers have 95% confidence that 50%
of all U.S. teens would say that they have misrepresented their age online.
B. The meaning of p=0.50 is that the researchers have 95% confidence that 50% of
the 646 teens in the sample said they have misrepresented their age online.
C. The meaning of p=0.50 is that 50% of the 646 teens in the sample said they
have misrepresented their age online. This is the researchers' best estimate of p,
the proportion of all U.S. teens who would say they have done so.
D. The meaning of p=0.50 is that 50% of the 646 teens in the sample said they
have misrepresented their age online. This - (ANSWER)C. The meaning of p=0.50
is that 50% of the 646 teens in the sample said they have misrepresented their
,2|Page
age online. This is the researchers' best estimate of p, the proportion of all U.S.
teens who would say they have done so.
A research company polled a random sample of
646 teens about Internet use 50% of those teens reported that they had
misrepresented their age online to gain access to websites and online services. SE
(P^) = .020 Explain what this standard error means in the context of this situation.
A. The standard error is the best estimate of the margin of error of the poll. The
researchers can be confident that the difference between p and p is not greater
than the standard error.
B. The standard error is the best estimate of the standard deviation of the
sampling distribution of the proportions, which measures the amount of variation
in the sample and population proportions.
C. The standard error is the best estimate of the standard deviation of the
sampling distribution of the proportions, which measures the amount of variation
in the sample proportion expected to be seen from sample to sample when 646
teens are asked the po - (ANSWER)C. The standard error is the best estimate of
the standard deviation of the sampling distribution of the proportions, which
measures the amount of variation in the sample proportion expected to be seen
from sample to sample when 646 teens are asked the polling question.
Reaching out 2 standard errors on either side of the sample proportion makes us
__________ confident that the true proportion is captured within the interval. -
(ANSWER)95%
Of 575 broiler chickens purchased from various kinds of food stores in different
regions of a country and tested for types of bacteria that cause food-borne
, 3|Page
illnesses, 36% were infected with a particular bacterium. 95% CI = 32.1% - 39.9%
What does the confidence interval say about chicken sold in the country?
A. There is a 95% chance that the true proportion of broiler chickens infected with
the bacterium is in the interval.
B. In 95% of samples of broiler chickens sold in the country, the proportion
infected with the bacterium will be in the interval.
C. We are 95% confident that the interval captures the true proportion of all
broiler chickens sold in the country that are infected with the bacterium. -
(ANSWER)C. We are 95% confident that the interval captures the true proportion
of all broiler chickens sold in the country that are infected with the bacterium.
Of 575 broiler chickens purchased from various kinds of food stores in different
regions of a country and tested for types of bacteria that cause food-borne
illnesses, 36% were infected with a particular bacterium. A government
spokesperson claimed that the sample size was too small, relative to the billions
of chickens slaughtered each year, to generalize. Is this criticism valid?
A. Yes, the sample size must be at least 10% of the population, or the results
cannot be generalized.
B. No, as long as the necessary assumptions and conditions were met, the results
can be generalized.
C. Yes, until another study produces a similar interval, the results cannot be
generalized. - (ANSWER)B. No, as long as the necessary assumptions and
conditions were met, the results can be generalized.
A polling company conducts an annual poll of adults about political opinions. The
survey asked a random sample of 473 adults whether they think things in the
country are going in the right direction or in the wrong direction 71% said that
