3.13 SOC A sample of 25 first-year students at a university wrote a test that measured their literacy skills in reading and writing (their test scores were the number of incorrect answers, so the higher the score, the poorer the skills).

a. Compute the median and mean scores for these data.

10 43 30 30 45 40 12 40 42 35 45 25 10 33 50 42 32 38 11 47 22 26 37 38 10

b. These same 25 students wrote the same test during their final year. Compute the median and mean for this second set of scores and compare them to the earlier set. What happened?

10 45 35 27 50 35 10 50 40 30 40 10 10 37 10 40 15 30 20 43 23 25 30 40 10