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What price do farmers get for their watermelon crops? In the third week of July, a random sample of 43 farming regions gave a sample mean of x $6.83 per 100 pounds of watermelon. Assume that
is known to be $1.98 per 100 pounds.
(a) Find a 91% confidence interval for the population mean price (per 100 pounds) that farmers in this region get for their watermelon crop. What is the margin of error? (Round your answers to
two decimal places.)
lower limit
$
upper limit
margin of error S
(b) Find the minimal sample size necessary for a 91% confidence level with maximal error of estimate E- 0.35 for the mean price per 100 pounds of watermelon. (Round your answer to a whole
number.)
farming regions
(c) A farm brings 13 tons of watermelon to market. Find a 91% confidence interval for the population mean cash value of this crop. What is the margin of error? Hint: 1 ton is 2000 pounds. (Round your answers to the nearest dollar.)
