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In a random sample taken in Toronto of 400 adults and 600 teenagers who watch the television program X-Rangers, 100 adults and 300 teenagers indicated
In a random sample taken in Toronto of 400 adults and 600 teenagers who watch the television program X-Rangers, 100 adults and 300 teenagers indicated they liked it.
(a) What is the 95% confidence interval for the difference in proportions for all adults and teenagers in Toronto who watch this television program?
(b) What does a 95% confidence interval mean?
(c) How large would each of the samples have to be in order to be 98% confident in the same interval you calculated in (a)?
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