The mean age of 30 randomly selected Republican Senators was 61 years 247 days old (61.675 years) with a standard deviation of 10.17 years. The mean age of 30 randomly selected Democratic senators was 61 years 257 days old (61.704 years) with a standard deviation of 9.55 years. (Hint: older means greater than) Do the data indicate that Democratic senators are older than Republican senators, on average? Test at a 5% level of significance What is the critical value? (hint: this is a one-tailed positive test)

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