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.
In 2010, the median age of persons living in Washington State was 37.3 years. Jefferson County had the highest median age at 53.9 years. San Juan and Wahkiakum Counties were close behind at 52.7 years and 52.3 years respectively. Whitman County, home of Washington State University, had the state's lowest median age (24.4 years). Franklin County (28.4 years) and Adams County (29.0 years) were the only two additional counties with median age less than 30 years.