Python eggs. How is the hatching of water python eggs influenced by the temperature of the snake’s nest? Researchers assigned newly laid eggs to one of three temperatures: hot, neutral, or cold. Hot duplicates the extra warmth 538 CHAPTER 24 Two-Way Tables and the Chi-Square Test provided by the mother python, and cold duplicates the absence of the mother.

Here are the data on the number of eggs and the number that hatched:

Eggs Hatched Cold 27 16 Neutral 56 38 Hot 104 75

(a) Make a two-way table of temperature by outcome (hatched or not).

(b) Calculate the percentage of eggs in each group that hatched. The researchers anticipated that eggs would not hatch in the cold environment. Do the data support that anticipation?