The survival times in days of 72 guinea pigs after they wereinjected with infectious bacteria in a medical experiment isdisplayed in the table.
| 43 | 45 | 53 | 56 | 56 | 57 | 58 | 66 | 67 | 73 | 74 | 79 |
| 80 | 80 | 81 | 81 | 81 | 82 | 83 | 83 | 84 | 88 | 89 | 91 |
| 91 | 92 | 92 | 97 | 99 | 99 | 100 | 100 | 101 | 102 | 102 | 102 |
| 103 | 104 | 107 | 108 | 109 | 113 | 114 | 118 | 121 | 123 | 126 | 128 |
| 137 | 138 | 139 | 144 | 145 | 147 | 156 | 162 | 174 | 178 | 179 | 184 |
| 191 | 198 | 211 | 214 | 243 | 249 | 329 | 380 | 403 | 511 | 522 | 598 |
To access the complete data set, click the link for yourpreferred software format:
Excel  Minitab  JMP  SPSSTI  R  Mac-TXT   PC-TXT  CSVCrunchIt!
(a) Use the software of your choice to graph the distributionand describe its main features. Select the best description fromthe given choices.
The distribution is strongly left‑skewed, with the center around100 days and a range from about 0 days to about 600 days.
The distribution is strongly right‑skewed, with the centeraround 100 days and a range from about 0 days to about 600days.
The distribution is bimodal, with the center around 100 days anda range from about 0 days to about 600 days.
The distribution is Normal, with the center around 300 days anda range from about 0 days to about 600 days.
(b) Use the software of your choice to calculate the five‑numbersummary for these data. (Enter your answers rounded to one decimalplace.)
Min=
days
?1=
days
Median=
days
?3=
days
Max=
days
Calculate the mean for these data. (Enter your answer rounded toone decimal place.)
mean=
days
Summarize your findings. Choose the best statement.
The median is closer to ?1 than to ?3
The mean and the median are almost equal.
The median is closer to ?3 than to ?1
The mean is closer to ?1 than to ?3
