Four analysts obtain the following data for a spectrophotometric analysis of an injection

containing the local anaesthetic bupivacaine. The stated content of the injection is $0\mathrm{.}25\%$

weight in volume $($w$/$v$).$

Analyst $1$: $0\mathrm{.}245\%$ w$/$v$,0\mathrm{.}234\%$ w$/$v$,0\mathrm{.}263\%$ w$/$v$,0\mathrm{.}261\%$ w$/$v$,0\mathrm{.}233\%$ w$/$v$.$

Analyst $2$: $0\mathrm{.}236\%$ w$/$v$,0\mathrm{.}268\%$ w$/$v$,0\mathrm{.}247\%$ w$/$v$,0\mathrm{.}275\%$ w$/$v$,0\mathrm{.}285\%$ w$/$v$.$

Analyst $3$: $0\mathrm{.}248\%$ w$/$v$,0\mathrm{.}247\%$ w$/$v$,0\mathrm{.}248\%$ w$/$v$,0\mathrm{.}249\%$ w$/$v$,0\mathrm{.}253\%$ w$/$v$.$

Analyst $4$: $0\mathrm{.}230\%$ w$/$v$,0\mathrm{.}233\%$ w$/$v$,0\mathrm{.}227\%$ w$/$v$,0\mathrm{.}230\%$ w$/$v$,0\mathrm{.}229\%$ w$/$v$.$

Calculate the mean percentage of stated content and RSD for each set of results at the $68\%$

confidence level. Assuming the content really is as stated on the label, comment on the

accuracy and precision of each set of results. Calculate the precision of each assay with regard

to $95\%$ confidence limits$.$