Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. Complete parts (a) through (c) below. Click the icon to view a t distribution table. (13.046,22.15) a. What is the number of degrees of freedom that should be used for finding the critical value \( \mathrm{t}_{\alpha / 2} \) ? df \( =\square \) (Type a whole number.)

The number of degrees of freedom (df) is typically calculated as \( n - 1 \), where \( n \) is the sample size. If you have the sample size, you can simply subtract 1 from it to find the degrees of freedom needed to locate the critical \( t_{\alpha/2} \) value from the t-distribution table. If the sample size from your data is known, plug that number into the formula for an accurate df! For example, if your sample size \( n \) is 15, then df would be \( 15 - 1 = 14 \). Don't forget to specify the sample size for precise calculations!