The single-sample t-test compares the mean of the sample to a given number (which you supply). The dependent-sample t-test compares the difference in the means from the two variables to a given number (usually 0), while taking into account the fact that the scores are not independent.The independent samples t-test compares the difference in the means from the two groups to a given value (usually 0).he single sample t-test tests the null hypothesis that the population mean is equal to the given number specified using the option H0=. In our example, the t-value for variable write is 4.14 with 199 degrees of freedom.
Vermont had the second-highest median age, at 42.3 years. New Hampshire was third, with a median age of 42. Utah was the youngest state, with a median age of 29.9 years. Officials say among Maine counties, Lincoln is the oldest with a median age of 49.4 years. Androscoggin County was the youngest, at 40.5 years.
The nation as a whole grew nearly two years older since the last Census count in 2000, when the median age was 35.3. In 1990, it was just 32.7. The second oldest state is Vermont, with a median age of 41.5. West Virginia's median is 41.3 and New Hampshire's is 41.1. Seven states have a median age of more than 40 years. Florida did have the highest percentage of senior citizens -- residents aged 65 or older -- at 17.3%. That was well above the national median of 13%.