Question: 12. Gary constructs a 90% confidence interval in order to estimate the proportion of consumers who regularly purchase their groceries online. The interval ends up

12. Gary constructs a 90% confidence interval in order to estimate the proportion of consumers who regularly purchase their groceries online. The interval ends up between from 0.355 to 0.405. Using the same sample data, Ralph constructs a 95% confidence interval and obtains an interval from 0.365 to 0.395. If we assume no calculation errors were made when the 90% confidence interval was constructed, why must Ralph's interval be incorrect?

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