21.28 I have provided the table and the question that you may need to answer the question. Thank you Using public libraries. Exercise 21.13 reports a 2016 Pew Research Center survey on public library usage in which 768 in a sample of 1601 American adults said that they had visited, in person, a library or bookmobile in the last year. Use Table 21.1 to give a 99% confidence interval for the proportion of all American adults who have done this.How does your interval compare with the 95% confidence interval of Exercise 21.13? Table 21.1 Critical values of the Normal distributionsConfidence level CCritical value z*Confidence level CCritical value z'50%0.6790%1.6460%0.8495%1.9670%1.0499%2.5880%1.2899.9%3.29 21.13 Using public libraries. In 2016, the Pew Research Center reported the results ofa survey about public library usage. A nationally representative sample of 1601 peopleages 16 and older who were living in the United States completed the survey. Onesurvey question asked whether the survey respondent had visited, in person, a libraryor a bookmobile in the last year. A total of 768 of those surveyed answered “yes" to thisquestion. Although the samples in national polls are not SRSS, they are similar enoughthat our method gives approximately correct confidence intervals.a. Explain in words what the parameter p is in this setting.b. Use the poll results to give a 95% confidence interval for p.c. Write a short explanation of your findings in part (b) for someone who knows nostatistics.

The sample proportion p of individuals with the favorable response are given by p=xn=7681601=0.48…

Answered: Exercise 21.13 reports a 2016 Pew…

MATLAB: An Introduction with Applications

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21.28 I have provided the table and the question that you may need to answer the question. Thank you

Using public libraries. Exercise 21.13 reports a 2016 Pew Research Center survey on public library usage in which 768 in a sample of 1601 American adults said that they had visited, in person, a library or bookmobile in the last year. Use Table 21.1 to give a 99% confidence interval for the proportion of all American adults who have done this.

How does your interval compare with the 95% confidence interval of Exercise 21.13?

Table 21.1 Critical values of the Normal distributions
Confidence level C
Critical value z*
Confidence level C
Critical value z'
50%
0.67
90%
1.64
60%
0.84
95%
1.96
70%
1.04
99%
2.58
80%
1.28
99.9%
3.29

21.13 Using public libraries. In 2016, the Pew Research Center reported the results of
a survey about public library usage. A nationally representative sample of 1601 people
ages 16 and older who were living in the United States completed the survey. One
survey question asked whether the survey respondent had visited, in person, a library
or a bookmobile in the last year. A total of 768 of those surveyed answered “yes" to this
question. Although the samples in national polls are not SRSS, they are similar enough
that our method gives approximately correct confidence intervals.
a. Explain in words what the parameter p is in this setting.
b. Use the poll results to give a 95% confidence interval for p.
c. Write a short explanation of your findings in part (b) for someone who knows no
statistics.

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