A 2012 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 form: “estimate ± margin of error.” What is the range of values (lower bound, upper bound) that corresponds to this confidence interval? (Enter your answers as a whole number.) lower bound: upper bound: (b) What is the parameter captured by this confidence interval? What does it mean to say that we have " 95% confidence" in this interval? The parameter captured by this interval is the population mean weekly spending on food ???? for all American adults. " 95% confidence" means that this interval was found using a procedure that produces correct results 95% of the time. The parameter captured by this interval is the populations weekly spending on food ???? for all American adults. " 95% confidence" means that this interval is correct 95% of the time. The parameter captured by this interval is the population mean weekly spending on food ???? for all American adults. " 95% confidence" means that this interval represents 95% of the population of American adults. The parameter captured by this interval is the populations weekly spending on food ???? for all American adults. " 95% confidence" means that this interval was found using a procedure that produces correct results 95% of the time.