Wells Fargo Bank’s call center has representatives that speak both English and Spanish. A random sample of 11 calls to English-speaking service representatives and a random sample of 14 calls to Spanish-speaking service representatives was taken and the time to complete the calls was measured. The results (in seconds) are as follows:

Time to Complete the Call (in seconds)
English-
Speaking 131 80 140 118 79 94 103 145 113 100 122 Spanish-
Speaking 170 177 150 208 151 127 147 140 109 184 119 149 129 152

a. Compute the mean and standard deviation for the time to complete calls to English-speaking service representatives.

b. Compute the mean and standard deviation for the time to complete calls to Spanish-speaking service representatives.

c. Compute the coefficient of variation for the time to complete calls to English-speaking and Spanishspeaking service representatives. Which group has the greater relative variability in the time to complete calls?

d. Construct box and whisker plots for the time required to complete the two types of calls and briefly discuss.