One key metric for measuring overall call center performace is service level which is defined as the percentage calls answered by a human agent within a specified number of seconds. The accompanying data are the times seconds, to answer 50 incoming calls to a financial services call center. Complete parts (a) through (d). Click the icon to view the answer time data. a. At the 0.01 level of significance, is there evidence that the population mean time to answer calls is less than seconds? Determine the null and alternative hypotheses. Ho HY (Type integers or decimals. Do not round.) Determine the test statistic The test statistic is (Round to two decimal places as needed.) Determine the p-value. The p-value is (Round to three decimal places as needed.) Determine the proper conclusion Ho There is evidence at the 0.01 level of significance to conclude that the populati T20 seconds mean time to answer calls is b Answer Time Data 16 18 ZLI SL 17 22 9 19 15 10 1282129922 14 16 61 6 16 18 23 16 17 10 6 19 15 14 25 6 EL 18 EL EL OL EL BL 10 5 14 11 15 24 15 27 29 Print Done The assumption valid because the histogram X Her to conduct the t test in (a)? pose the correct graph below. TO 20 Answe Time OD Frequency est in (a) is valid? Explain. 10 Answer Time