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7. A researcher selects a random sample. A 90% confidence interval for a population mean
A) is an interval with margin of error ± 90%. B) has the property that if we repeatedly selected our random sample in exactly the same
way, each time constructing a different 90% confidence interval for , then in the
long run 90% of those intervals would contain . C) (a) and (b) are both true. D) is an interval that has width .90.