A recent study evaluated how addicted teenagers become to nicotine once they start smoking. The response variable was the number of yes answers on a questionnaire called the Hooked on Nicotine Checklist (HONC). Of teenagers who had tried tobacco, the mean HONC score was 3.8(.4) for the 142 females and 2.4(.2) for the 174 males. Complete parts a through c :

Find the standard error comparing the sample mean. Interpret.

Input answer: round to four decimal place