The average retirement age in the US is about 63 years with a standard deviation of 1 year. In one state, the average retirement age is 62 years with a standard deviation of 0.5. What statistical test should be used to determine if there is a statistical difference between the average retirement age in this state and the average retirement age in the US?   Select one:   1. 1-sample z-test 2. 2 sample t-test 3. 1 sample t-test 4. 2-sample z-test

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