A simple random sample of 18 one-half-carat diamonds had the following prices, in dollars: 1676, 1442, 1995, 1718, 1826, 2071, 1947, 1983, 2146, 1995, 1876, 2032, 1988, 2071, 2234, 2108, 1941, 2316 a. Apply the t-interval procedure to these data to find a 90% confidence interval for the mean price of all one-half-carat diamonds. Interpret your result. (Note: x-bar = $1964.70 and s = $206.50) Obtain a normal probability plot, a boxplot, a histogram, and a stem-and-leaf diagram of the data. b. Based the graphs, is it reasonable to apply the t-interval procedure as was done in part a? Explain