In 1898, Hermon Bumpus studied a number of house sparrows thatwere brought to the Anatomical Laboratory of Brown University afteran uncommonly severe winter storm. 35 birds survived and 24perished.
In the spreadsheet, the weights of birds in grams (g) aregiven.
Is there a significant difference between the weights of thesparrows that perished and the weights of the sparrows thatsurvived?
Using a t-test of independent samples (let alpha = 0.05), answerthe following.
- Critical value of t = ? (hint: this is a two-tailed test)
- Should you reject the null hypothesis? (yes or no)
| WEIGHT | STATUS |
| 24.50 | survived |
| 26.90 | survived |
| 26.90 | survived |
| 24.30 | survived |
| 24.10 | survived |
| 26.50 | survived |
| 24.60 | survived |
| 24.20 | survived |
| 23.60 | survived |
| 26.20 | survived |
| 26.20 | survived |
| 24.80 | survived |
| 25.40 | survived |
| 23.70 | survived |
| 25.70 | survived |
| 25.70 | survived |
| 26.30 | survived |
| 26.70 | survived |
| 23.90 | survived |
| 24.70 | survived |
| 28.00 | survived |
| 27.90 | survived |
| 25.90 | survived |
| 25.70 | survived |
| 26.60 | survived |
| 23.20 | survived |
| 25.70 | survived |
| 26.30 | survived |
| 24.30 | survived |
| 26.70 | survived |
| 24.90 | survived |
| 23.80 | survived |
| 25.60 | survived |
| 27.00 | survived |
| 24.70 | survived |
| 26.50 | perished |
| 26.10 | perished |
| 25.60 | perished |
| 25.90 | perished |
| 25.50 | perished |
| 27.60 | perished |
| 25.80 | perished |
| 24.90 | perished |
| 26.00 | perished |
| 26.50 | perished |
| 26.00 | perished |
| 27.10 | perished |
| 25.10 | perished |
| 26.00 | perished |
| 25.60 | perished |
| 25.00 | perished |
| 24.60 | perished |
| 25.00 | perished |
| 26.00 | perished |
| 28.30 | perished |
| 24.60 | perished |
| 27.50 | perished |
| 31.10 | perished |
| 28.30 | perished |
