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Students from 2011 showed that about 25% of all Vancouver residents are using . A random
sample of 200 Vancouver residents was drawn and whether they are using iphone was recorded.
a. Provide a description of the statistic of interest.
b. Identify the sampling distribution of the statistic above.
c. What is the probability that less than 20% of the 200 randomly selected residents are using
iphones ?
Answer: 0.05

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