To find the critical values for a two-tailed confidence interval at a confidence level of 0.90 with a sample size of 16, you can consult a t-distribution table or use statistical software.
For a confidence level of 0.90 and a sample size of 16, the critical values are approximately [tex]( t_{\text{cr}} = \pm 1.753)[/tex] (rounded to three decimal places).
Therefore, [tex]( x_{2R} = 1.753)[/tex] and [tex]( x_{2L} = -1.753)[/tex]
