summer intern at the Lego factory in Billund, Denmark, samples 43 yellow bricks and 28 red bricks and measures their weight. She finds sample means of 4 grams (yellow bricks) and 4.3 grams (red bricks), and sample standard deviations of 0.16 (yellow) and 0.24 (red), respectively. Compute the 95% confidence interval for the mean weight of red bricks. lower bound number (rtol