Suppose a random sample of 14 people 3039 years of age produced the household incomes shown here. Use these data to determine a point estimate for the population variance of household incomes for people 3039 years of age and construct a 95% condence interval. Assume household income is normally distributed. $37,800 44.800 33.500 36.300 42.300 32.400 28.500 41.200 46.600 38.500 40.200 33.600 35.500 36.800 Appendix AStatistical Tables The point estimate is l . l s 02 s l