One of the major measures of the quality of service provided by any organization is the speed with which it responds to customer complaints. A large family-held de- partment store selling furniture and flooring, including carpet, had undergone a major expansion in the past several years. In particular. the ooring department had expanded from 2 installation crews to an installation supervisor, a measurer, and 15 installation crews. The store had the busi- ness objective of improving its response to complaints. The variable of interest was defined as the number of days between when the complaint was made and when it was resolved. Data were collected from 50 complaints that were made in the past year. The data. stored in Furniture , are as follows: 54 5 35 137 31 27 152 2 123 SI 74 27 ll 19 126 110 110 29 61 35 94 3| 26 5 l2 4 165 32 29 28 29 26 25 I I4 13 13 10 5 27 4 52 30 22 36 26 20 23 33 68 a. The installation supervisor claims that the mean number of days between the receipt of a complaint and the reso- lution of the complaint is 20 days. At the 0.05 level of signicance. is there evidence that the claim is not true (i.e.. that the mean number of days is different from 20)