How Big Are Gribbles? Gribbles are small, pale white, marine worms that bore through wood. While sometimes considered a pest since they can wreck wooden docks and piers, they are now being studied to determine whether the enzyme they secrete will allow us to turn inedible wood and plant waste into biofuel.24 A sample of 50 gribbles finds an average length of 3.1 mm with a standard deviation of 0.72. Give a best estimate for the mean length of gribbles, a margin of error for this esti- mate (with 95% confidence), and a 95% confidence interval. Interpret the confidence interval in con text. What do we have to assume about the sample in order to have confidence in our estimate? 1. Find the upper and lower bound for this confidence interval.
How Big Are Gribbles? Gribbles are small,
pale white, marine worms that bore through wood.
While sometimes considered a pest since they can
wreck wooden docks and piers, they are now being
studied to determine whether the enzyme they
secrete will allow us to turn inedible wood and
plant waste into biofuel.24 A sample of 50 gribbles
finds an average length of 3.1 mm with a standard
deviation of 0.72. Give a best estimate for the
mate (with 95% confidence), and a 95% confidence
interval. Interpret the confidence interval in con
text. What do we have to assume about the sample
in order to have confidence in our estimate?
1. Find the upper and lower bound for this confidence interval.
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