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 countryâs farmers and ranchers are getting older, and there are fewer people standing in line to take their place. New Mexico has the highest average age of farmers and ranchers of any state at nearly 60, and neighboring Arizona and Texas arenât far behind. Nationally, agricultural census figures show that the fastest-growing group of farmers and ranchers is the segment over 65. The Agriculture Department is beginning work on its 2012 census, and Merrigan is afraid the average age will be even higher when the statistics are compiled.