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Mathematics, 12.11.2019 05:31 Madeline6117
A2012 gallup survey of a random sample of 1014 american adults indicates that american families spend on average $151 per week on food. the report further states that, with 95% confidence, this estimate has a margin of error of ±$7.
(a) this confidence interval is expressed in the following form: "estimate ± margin of error." what is the range of values (lower bound, upper bound) that corresponds to this confidence interval?
(b) what is the parameter captured by this confidence interval? what does it mean to say that we have "95% confidence" in this interval?
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