Question: a. Verify that a 95% level of confidence requires a 1.96-standard-deviation interval. b. Verify that the level of confidence for a 2-standard-deviation interval is 95.45%.

a. Verify that a 95% level of confidence requires a 1.96-standard-deviation interval.
b. Verify that the level of confidence for a 2-standard-deviation interval is 95.45%.

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