What price do farmers get for their watermelon crops? In the third week of July, a random sample of 44 farming regions gave a sample mean of  = $6.88 per 100 pounds of watermelon. Assume that ? is known to be $1.92 per 100 pounds. (b)  Find the sample size necessary for a 90% confidence level with maximal error of estimate E = 0.33 for the mean price per 100 pounds of watermelon. (Enter a number. Round up to the nearest whole number.)   ______ farming regions (c)  A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop (in dollars). What is the margin of error (in dollars)? Hint: 1 ton is 2000 pounds. (For each answer, enter a number. Round your answers to two decimal places.) lower limit     $ _____ upper limit     $ _____ margin of error     $ _____

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