hi i tried to do this by multiplying z-statistic by standard error which i found by dividing standard deviation by square root of 71 (1997 - 1926) … but in the book they are not multiplying by standard error…they are multiplying by standard deviation… is it cuz 1926 to 1997 is the time duration of data collection and not the sample size…
The sample size is one: 1998.
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