6) Referring to Table 10-2, what is the 95% confidence interval estimate for the difference between two means? 7) Referring to Table 10-2, what is the 90% confidence interval estimate for the difference between two means? Refer to the table of times in the excel file entitled Telephone Office. For each office we have a sample of 20 times it takes in minutes to clear problems on phone lines in by that office. Use the data analysis pack to calculate the statistical values and answer the following questions: 8) What are the null and research(alternate) hypotheses? 9) Using the excel Data Analysis pack find the critical value for alpha = .05 10) Is there evidence of a statistically significant difference between the two offices