Find the 90% confidence interval for the average shell length of all N. trivittata sea snails. What is the standard error used to calculate this interval? Round to the 1,000ths place.

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Confidence Interval for One Population Mean
In 1903, a paper published by Abigail Camp Dimon, discussed the
effect of environment on the shape and form of two sea snail
species. Nassa obsoleta and Nassa trivittata. One of the variables
that Dimon considered was the length of the shell. A random
sample of 300 N. trivittata specimens was selected. The average
shell length for the sample was 15.9 mm., with a standard
deviation of 2.89 mm.
Find the 90% confidence interval for the average shell length of
all N. trivittata sea snails.
What is the standard error used to calculate this interval? Round
to the 1,000ths place.
Transcribed Image Text:Confidence Interval for One Population Mean In 1903, a paper published by Abigail Camp Dimon, discussed the effect of environment on the shape and form of two sea snail species. Nassa obsoleta and Nassa trivittata. One of the variables that Dimon considered was the length of the shell. A random sample of 300 N. trivittata specimens was selected. The average shell length for the sample was 15.9 mm., with a standard deviation of 2.89 mm. Find the 90% confidence interval for the average shell length of all N. trivittata sea snails. What is the standard error used to calculate this interval? Round to the 1,000ths place.
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