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Case 6: Fish Farming

© Jostein Lillestøl NHH, Bergen

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Fish Farming - Solution

Time Mean St.Dev. Ratio

--- Year1-Week24 42.35 8.03 5.28 Year1-Week37 221.39 42.62 5.19 Year1-Week41 307.43 57.51 5.35 Year1-Week46 454.97 96.50 4.71 Year1-Week50** 593.33 121.31 4.89 Year2-Week03 772.07 152.61 5.06 Year2.Week12 986.22 174.86 5.64 Year2-Week29 1619.60 318.67 5.08 Year2-Week39 2509.70 501.61 5.00 Year2-Week47 3390.30 808.02 4.20 Year3-Week06* 4248.40 1061.36 4.00

All pass Normality test at 10% level, except * (P=0.074) and ** (P=0.028). We see a fairly constant ratio between the mean and the corresponding standard deviation. If the mean is estimated by observation or judgment we may take the standard deviation as 1/5 of that.

Two weight distributions about a year apart are illustrated by histograms:

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