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In 1980, census results indicated that the age at which American men first married had a...

In 1980, census results indicated that the age at which American men first married had a mean of 23.3 years. It is widely suspected that young people today are waiting longer to get married. We want to find out if the mean age of first marriage has increased during the past 37 years. A random sample of 40 men who married for the first time last year is selected, and the results found a mean of 24.2 years and a standard deviation of 5.3 years? Is there evidence the mean age at first marriage for men has increased. Test using a 5% significance level.

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