You are interested in determining the difference in two population means. You select a random sample of eight items from the first population and eight from the second population and then compute a 95% confidence interval. The sample from the first population has an average of 12.2 and a standard deviation of 0.8. The sample from the second population has an average of 11.7 and a standard deviation of 1.0. Assume that the values are normally distributed in each population. The point estimate for the difference in means of these two populations is__. O-0.2 0.2 O 0.5 O-0.5 O 0.06