It has been reported by a university's president that 60% of the students are using their cell phones during class to text their peers.A professor wants to see if her students are using their cell phones less frequently than the general population. The professor surveys the students and ask them to report the number of minutes they use the cell phones during a day at the university.

Open the Excel file "cell phone use" and using SPSS conduct a t-test to test the professor's assumption that her students will use their cell phones significantly less frequently than the general population at the university (alpha = .05). Calculate and interpret the effect size for this test.

0.25 0.33 0.5 0.25 0.2 0.1 0.5 0.2 0.45 0.1 0.6 0.85 0.2 0.5 0.6 0.75 0.33 0.8 0.65 0.75 0.29 0.3 0.65 0.4 0.5