A store prides itself on customer service. The firm surveyed 50 customer complaints and found a mean number of days from receipt of a complaint and the resolution of the complaint to be 43.04 days with a standard deviation of 41.926 days/ An installation supervisor claims that the mean number of days between the receipt of a complaint and the resolution of the complaint is 20 days. At the 0.05 level of significance, is there evidence that the claim is not true (i.e., that the mean number of days is different than 20)? Assume a normal distribution. a. What is the standard error and degrees of freedom? O 5.93 and 49 O 41.93 and 50. O 5.93 and 48. O .8385 and 49 b. What is the critical value to use? O 3.8858 O 2.0096 O 1.96 c. What is the test statistic? O 3.8858 O 5.929 O 2.0096 d. Based on sample evidence, what is the correct conclusion? O Don't reject Ho. The test statistic is less than the critical value. O Reject Ho. It appears that the time to resolve complaints is not 20 days. O Accept Ho. The manager is correct; there is not enough evidence to dispute his claim of 20 days