A computer-gaming entrepreneur who develops and sells new games to major manufacturers of systems such as Xbox", Wij', and PS3" wants to estimate the percentage of households with teenagers, that own any of these gaming systems. The entrepreneur randomly selects 500 households with teenagers and performs a survey to determine whether or not each household owns an Xbox"", Wii'm, PS3", or some similar system. He determines that 421 of the households he surveyed own such systems. Compute the confidence interval estimate for the proportion of the general population of households with teenagers that own a gaming system. Check that the assumption for normality is met and interpret the meaning of the confidence interval estimate in context. Use a 95% confidence level