Salary. Due to the rising cost for higher education, quite a number of diploma graduates have either started working first and then continuing their studies when they have enough savings, or they study and work at the same time. An analysis study was conducted to determine the difference in the monthly salary of 10 students when they started to work with a diploma certificate and after they had earned their bachelor’s degree. Here are the data that were collected:

a) Are these paired data? Why or why not?

b) Was there a statistically significant change in the starting salary of students when they started to work with a diploma certificate and after they had earned their bachelor’s degree?

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Monthly Salary ($) Student Diploma Bachelor's 1 1,300 2,500 2 1,350 2,100 3 1,290 2,700 4 1,320 3,000 5 1,310 2,900 60 1,280 3,100 7 1,300 2,850 8 1,290 3,050 9 1,300 3,000 10 10 1,295 2,950