18. According to the Kaiser Family Foundation, children ranging from ages 8 to 18 average ?.5 hours per day with electronic media in 2999 (up from 6 hours in 1999). Assume the population standard deviation is 2.4 hours per day. A random sample of 39 children from this age group was selected with a sample average of 9.9 hours per day. a) Is there support for this claim using the criteria that was previously discussed