Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value $t_{\alpha /2}$, (b) find the critical value $z_{\alpha /2}$, or (c) state that neither the normal distribution nor the $t$ distribution applies.

The confidence level is $95\mathrm{\%},\sigma$ is not known, and the histogram of 55 player salaries (in thousands of dollars) of football players on a team is as shown.
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A. $t_{\alpha /2}=$
(Round to two decimal places as needed.)
B. $z_{\alpha /2}=$
(Round to two decimal places as needed.)

Step 1 ：Since the population standard deviation $\sigma$ is not known and the sample size is less than 30, we should use the t-distribution to construct the confidence interval. Therefore, we need to find the critical value $t_{\alpha /2}$ for a 95% confidence level.

Step 2 ：The degrees of freedom for a t-distribution is given by the sample size minus 1. In this case, the degrees of freedom is $55-1=54$.

Step 3 ：The value of $\alpha$ is $1-0.95=0.05$. Since we are constructing a two-tailed test, we need to divide $\alpha$ by 2, which gives us $0.025$.

Step 4 ：Using these values, we can find the critical value $t_{\alpha /2}$.

Step 5 ：The critical value $t_{\alpha /2}$ for a 95% confidence level with 54 degrees of freedom is approximately $2.00$.

Step 6 ：Final Answer: $\boxed{{\displaystyle 2.00}}$