Q$3.$ A new procedure for the determination of sulfur in kerosene was tested on a reference sample known to contain $0\mathrm{.}123\%$ S$.$ The results reported were: $\%$ S $=0\mathrm{.}112,0\mathrm{.}118,0\mathrm{.}115,$ and $0\mathrm{.}119\%.$ Is there a difference between the experimental results and the "true" value $($at $95\%$ confidence Level?$)$

How to use the following Table $4-2$ to extract $t-$Table values for given set of data at a certain confidence level?

Extract the $t-$value by looking across the appropriate Row of #$DF$ and down the Column for the required $\%$ Confidence level. What is $)=(0?$

TABLE $4-2$ Values of Student's $t$

$\backslash$table$[[\backslash$table$[[$Degrees$],[$of freedom$]],$Confidence level $(\%)$