A researcher wants to determine the efficacy of a training program directed at improving concentration,focus,and memory on college students.She selects a random sample of 16 individuals and have them take an assessment initial test before the training program,then the individuals complete the training program,and at the end they take a final test that's comparable to the initial test.The results are shown in the following table: 
The analyst uses a Wilcoxon matched-pairs signed rank test with a 0.05 significance level.The value of σT is ______.
Definitions:
Civil Rights Act Of 1964
A landmark piece of federal legislation in the United States that outlawed discrimination based on race, color, religion, sex, or national origin.
Discrimination
The unjust or prejudicial treatment of different categories of people, especially on the grounds of race, age, or gender.
Antimiscegenation Laws
Historical laws that prohibited marriage or cohabitation between persons of different races, often aimed at maintaining racial purity.
Montgomery Bus Boycott
A significant event in the American civil rights movement where African Americans in Montgomery, Alabama, boycotted the city's bus system to protest segregated seating.
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