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in an effort to estimate the annual income for new graduates, data were collected from 100 new graduates over a one-year period. sample showed an

in an effort to estimate the annual income for new graduates, data were collected from 100 new graduates over a one-year period. sample showed an average income of 68000, standard population deviation 1200

if the data were collected for a sample of 50 graduates rather than 100, the 95% confidence interval estimate of thee popuulation mean amount earned is?

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