3) You measure the length of 5 radish seedlings at 7 days and 10 days and get the following results in mm (doNOT use R except for part (d)): (a)

Is there a difference in length? (b) Repeat (a), but now use aregular (unpaired) t-test. (c) What happened in (b)? (d) Verify the normal distribution assumption for the pairedt-test you did in (a).(You may use R for this part).