From her firm's computer telephone log, an executive found that the mean length of 64 telephone calls during July was 4.48 minutes with a standard deviation of 5.87 minutes. She vowed to make an effort to reduce the length of calls. The August phone log showed 48 telephone calls whose mean was 2.396 minutes with a standard deviation of 2.018 minutes.

b-1.) Obtain a test statistic t-calc and p-value assuming unequal variances, (Use Welch's formula to determine degrees of freedom. Round your answers to 3 decimal places.

t-calc ?

p-value ?