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 1797, Congress seated its youngest-ever member, 22-year-old William Charles Cole Claiborne of Tennessee, even though he didnât meet the constitutional age minimum. In 1869, the average age of members of Congress was just 45, far younger than any Congress of the 20th century. Life expectancy likely had something to do with the 19th-century preponderance of younger men: The average American born in 1900 expected to live only 49 years, compared to more than 78 today.