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Mathematics, 22.02.2021 06:40 bvaughn4152
12. Mr. Thomas of Wilmer Amina Carter High School (a large urban high school) wants to know what
proportion of the student body favors banning plastic water bottles from the school buildings and grounds.
A simple random sample of 152 students finds that 85 support banning plastic bottles.
(a) Construct and interpret a 95% confidence interval for the proportion of all students at Wilmer Amina
Carter High School who support banning plastic water bottles.
(b) The student council will ban the bottles if they are convinced that the majority of students favor it. Does
this confidence interval provide evidence for a ban? Explain.
(c) It turns out that the councilâs simple random sample was originally 165 students, but 13 individuals in
the sample didnât respond because they were on an Environmental Science field trip. Could this change
your answer to part (b)? Explain your reasoning with a calculation.
(d) In part (a) you constructed a 95% confidence interval for the proportion of students at Wilmer Amina
Carter High School who support banning plastic water bottles. Explain what you would expect to
happen to the length of the interval if the sample size was doubled.
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Answers: 3
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