Question

Refer to the accompanying data set of mean​ drive-through service times at dinner in seconds at two fast-food restaurants. Construct a

95​% confidence interval estimate of the mean​ drive-through service time for Restaurant X at​ dinner; then do the same for Restaurant Y. Compare the results.

Restaurant X					Restaurant Y
85 85	116 116	118 118	146 146	270 270	100 100	124 124	156 156	118 118	176 176
184 184	125 125	154 154	166 166	211 211	133 133	110 110	129 129	126 126	128 128
329 329	311 311	175 175	108 108	155 155	136 136	134 134	223 223	212 212	296 296
148 148	98 98	235 235	239 239	188 188	129 129	93 93	132 132	240 240	139 139
152 152	197 197	168 168	122 122	68 68	146 146	199 199	146 146	140 140	140 140
200 200	175 175	114 114	141 141	177 177	149 149	159 159	134 134	166 166	135 135
188 188	195 195	228 228	192 192	353 353	240 240	235 235	251 251	234 234	231 231
301 301	213 213	200 200	187 187	190 190	170 170	87 87	102 102	53 53	175 175
108 108	147 147	177 177	155 155	174 174	76 76	150 150	142 142	101 101	124 124
159 159	167 167	119 119	133 133	313 313	151 151	129 129	186 186	145 145	123 123

Answer 1