In a 2018 poll conducted by SurveyMonkey, they randomly surveyed368 students
from two- and four-year institutions across the U.S. Accordingto the survey, 58% purchased at
least one of their textbooks on Amazon. What proportion of allU.S. college students purchased
at least one of their textbooks on Amazon?
a. Use StatCrunch to find a 95% confidence interval:_________________
b. Interpret your confidence interval in words.
c. True or False: A 90% confidence interval would be wider thana 95% confidence interval.
d. If the true proportion of all U.S. college students whopurchased at least one of their
textbooks on Amazon was 62%, does our confidence intervalsupport or refute it?
