According to MediaCorp, a typical Singaporean spends an average of 3.1 hours perdaywatchingTVprogrammes.Assuming thepopulationisnormallydistributed, a randomly selected sample of 12 working adults revealed the mean amount of time they spent watching TV programmes is 3.425 hours and the standard deviation is 0.608 hours. At the 0.05 significance level, does this sample data suggest there is a difference between the national average and the sample mean of these working adults?