In a Singapore edition of Business Times diamond pricing was
In a Singapore edition of Business Times, diamond pricing was explored. The price of a diamond is based on the diamond's weight, color, and clarity. A simple random sample of 18 one-half-carat diamonds had the following prices, in dollars.
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. (x = $1964.7 and s = $206.5.)
b. Obtain a normal probability plot, a boxplot, a histogram, and a stem-and-leaf diagram of the data.
c. Based on your graphs from part (b), is it reasonable to apply the t-interval procedure as you did in part (a)? Explain your answer.
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