How is the hatching of water python eggs influenced by the...

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 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: $^{15}$ $$ \begin{array}{lccc} \hline & \text { Cold } & \text { Neutral } & \text { Hot } \\ \text { Number of eggs } & 27 & 56 & 104 \\ \text { Number hatched } & 16 & 38 & 75 \\ \hline \end{array} $$ (a) Make a two-way table of temperature by outcome (hatched or not). (b) Calculate the percent of eggs in each group that hatched. The researchers believed that eggs would be less likely to hatch in cold water. Do the data support that belief?

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 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: $^{15}$ $$
\begin{array}{lccc}
\hline & \text { Cold } & \text { Neutral } & \text { Hot } \\
\text { Number of eggs } & 27 & 56 & 104 \\
\text { Number hatched } & 16 & 38 & 75 \\
\hline
\end{array}
$$
(a) Make a two-way table of temperature by outcome (hatched or not).
(b) Calculate the percent of eggs in each group that hatched. The researchers believed that eggs would be less likely to hatch in cold water. Do the data support that belief?

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Key Concepts

Controlled Experiment

A controlled experiment is a research design where factors other than the independent variable are held constant to isolate the effect of that variable. In the study, the independent variable is the nest temperature, and by controlling for other factors, the researchers can assess its specific influence on the hatching rates of the eggs.

Contingency Table

A contingency table (or two-way table) is a structured format that displays the frequency distribution of variables. In this context, it organizes the eggs by temperature group and their hatching outcomes, allowing for easy visual comparison and analysis of how the variables interact.

Percentage Calculation

Calculating percentages involves determining the proportion of a subgroup that meets a specific condition relative to the total number in that subgroup. Here, it is used to assess the hatching success rate in each temperature category, which facilitates a direct comparison of outcomes across groups.

Data Interpretation

Data interpretation in statistics involves drawing conclusions from numerical data by comparing summary statistics, such as percentages. In this case, interpreting the data involves evaluating whether the differences in hatching rates among temperature groups support the hypothesis regarding temperature effects on hatching.

Transcript

00:01 We have a question here on whether or not a hatching of python eggs is influenced by the temperature of the snake's nest.

00:10 And so some researchers did a couple of different temperatures.

00:16 They did a hot, a neutral, and a cold.

00:19 And hot would duplicate the extra warm provided by the mother python.

00:24 And cold duplicates the absence of mother.

00:26 And there is some data that shows the number of eggs and the numbers that hatched based on cold, neutral, and hot.

00:33 This question wants you to make a two -way table of temperature outcome, hatched or not, and then to calculate the percentage of eggs in each group that's hatched.

00:43 They also want you to determine whether or not the data support whether or not the researchers believe that eggs would be less likely to hatch in cold water.

00:54 So we can take these numbers and we can make a two -way table.

01:00 Okay, so we'll go ahead and make our two -way table here.

01:03 So we're going to look at a couple of things.

01:05 We're going to put first and foremost, we're going to put hatched over here.

01:10 So hatched eggs.

01:13 And we're going to put not hatched.

01:20 And then we're going to have total.

01:24 And we're going to look at our different conditions.

01:27 Okay, so of coal...