Obervation Sample 1 Sample 2 1 10 8 279 3 13 7 496 584 11. Consider the data for two independent random samples that have been taken from two normal populations above. (a) Compute the two sample means. (5 points) (b) Compute the two sample standard deviations. (5 points) (c) Using the data provided, what is the point estimate for the difference between the two population means? (5 points) (d) Conduct at 90% confidence test for whether the two population means are different from each other?