I. I. UUlClll U A lab course instructor would like to know the average time that student teams spend in the lab classrooms conducting experiments and collecting data. The instructor gets information from 45 teams and calculates a 90% confidence level estimate of the average time to within i0.8 hours (that is, calculates the interval [average time 0.8 h, average time + 0.8 h]). How many teams should provide information to the instructor to obtain a 90% confidence level estimate to within i0.4 hours