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MAT 232 Exam 3 100% Correct!!!
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MAT 232 Exam 3 100% Correct!!!...
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MAT 232 Exam 3 100% Correct!!!A newspaper provided a "snapshot" showing the results of a poll of 1910 professionals
who interview job applicants. The snapshot indicated that 26% of those surveyed
responded that the biggest interview turnoff is that the applicant did not make an effort
to learn about the job or the company. The margin of error was given as plus or minus 3
percentage points. What key characteristic of the poll was not given?
a. The confidence level
b. The point estimate
c. The sample size
d. The confidence interval
a. the confidence level
Poll This poll in says that "nearly four in ten professionals have high levels of stress".
The sample size is stated as 1910 professionals, the point estimate is stated as 26%, and
the confidence interval is stated as plus or minus 3 percentage points around the point
estimate. However, the confidence level is not given. Often it is 95%, but media reports
usually do not mention the confidence level.
A magazine given the results of a poll of 500 adults that were asked to name their
favorite type of pie. Of the 500 respondents, 12% selected chocolate pie, and the margin
of error was stated to be plus or minus5 percentage points. Describe what is meant by
the statement that "the margin of error was given as plus or minus5 percentage points."
A. Hence, the study is only 5% confident that the true population percentage of people
that prefer chocolate pie is exactly 12%.
B. Hence, it's likely that the interval 12% plus or minus 5% does contain the true
population percentage of people that prefer chocolate pie.
, C. The statement suggests that the study is 100%minus5%equals95% confident that the
true population percentage of people that prefer chocolate pie is 12%.
D. The statement suggests that the true population percentage of people that prefer
chocolate pie is in the interval 12%plus or minus5%.
B. The statement suggests that the interval 12%plus or minus5% is likely to contain the
true population percentage of people that prefer chocolate pie.
The symbol for sample proportion
The symbol of 1-p hat(sample proportion)
Q hat
The value of n is
the sample size
The value of E is
the margin of error
The value of p is
the population proportion
The confidence level is 95%, what is the value of α?
.05 -subtract confidence level from 100
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