In 1898, Hermon Bumpus studied a number of house sparrows that were brought to t
ID: 2931428 • Letter: I
Question
In 1898, Hermon Bumpus studied a number of house sparrows that were brought to the Anatomical Laboratory of Brown University after an uncommonly severe winter storm. 35 birds survived and 24 perished. In the spreadsheet, the weights of birds in grams (g) are given. Is there a significant difference between the weights of the sparrows that perished and the weights of the sparrows that survived? Using a t-test of independent samples (let alpha = 0.05), answer the following. t = df = 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 perishedExplanation / Answer
Answers:
t = - 2.28
df = In statistics, the number of degrees of freedom is the number of values in the final calculation of a statistic that are free to vary. The number of independent ways by which a dynamic system can move, without violating any constraint imposed on it, is called number of degrees of freedom.
df = 35 + 24 - 2 = 57
t critical = -2.002 and 2.002
Reject null