QUESTION $18$

$6\mathrm{.}74($a to c$)$ Coaching the SAT.The confidence intervals, in order from a to c$,$ were

$(509\mathrm{.}85,526\mathrm{.}14)$;$(492\mathrm{.}24,543\mathrm{.}76)$;$(515\mathrm{.}42,520\mathrm{.}57)$

$(492\mathrm{.}24,543\mathrm{.}76)$;$(509\mathrm{.}85,526\mathrm{.}14)$;$(515\mathrm{.}42,520\mathrm{.}57)$

$(492\mathrm{.}24,543\mathrm{.}76)$;$(515\mathrm{.}42,520\mathrm{.}57)$;$(509\mathrm{.}85,526\mathrm{.}14)$