Many students suffer from math anxiety. Biostatistics lecturer offered his students a 2-hour lecture on math anxiety and ways to overcome it. The following table gives the test score for 7 students...

Many students suffer from math anxiety. Biostatistics lecturer offered his students a 2-hour lecture on math anxiety and ways to overcome it. The following table gives the test score for 7 students before and after they attended the lecture. Test at 5% significance level whether attending this lecture increases the score in Biostatistics.

Before
56
69
48
74
65
71
60

After
62
73
44
85
71
70
73