Suppose the method of tree ring dating gave the following dates
A.D. for an archaeological excavation site.
1277 1126 1205 1228 1131 1209 1150 1174 1186
Find a 90% confidence interval for the mean of all tree ring dates
from this archaeological site.
1157.6 to 1215.8
1157.1 to 1215.8
1158.9 to 1215.8
1157.1 to 1217.5
1158.9 to 1217.5
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