Complete b-1

Return to question 14 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. 2 (a) Choose the appropriate hypotheses for a right-tailed test. Assume / is the average call length in July and /2 is the average call points length in August. a. Ho: H1 - H2 SO vs. H1: H1 - H2> 0 b. Ho: H1 - H2