Please explain Q17
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Heyy,
In the above sum,
Sample size is 175 (greater than 30) so we can use Z-statistic.
Z statistic = (X-U)/standard error
where standard error = S/root over sample size
(here S is used because population variance is not given)
So
Z test statistic = 67000-58500/(5200/root 175) = 21.62.