Learn by Doing

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A list of StatCrunch directions is provided at the bottom of this text-box.

Context

Recall the following example: The average gestation period, or time of pregnancy, of an animal is closely related to its longevitythe length of its lifespan. Data on the average gestation period and longevity (in captivity) of 40 different species of animals have been recorded.

For the StatCrunch problem, you will analyze data for 40 species of animals in captivity.

Variables

animal: the name of the animal species gestation: the average gestation period of the species, in days longevity: the average longevity of the species, in years

The explanatory variable is average lifespan (longevity.) The response variable is length of pregnancy (average gestation period.)

Data

• Open the animals data set in the Stats at Cuyamaca College group on StatCrunch (directions - opens in a new tab).

Prompt

In the first question you will produce a scatterplot in StatCrunch (with longevityas the explanatory variable and gestation as the response variable) and then use StatCrunch to calculate the correlation coefficient.

List of StatCrunch Directions

• Open StatCrunch
• Open a datafile in the Stats at Cuyamaca College group
• Download StatCrunch Output Window (do not take screenshots;please use these directions)
• Embed Pictures in a Textbox (do not post attachments; please use these directions)
• Copy and Paste StatCrunch Text Output
• Create a Scatterplot in StatCrunch
• Produce the Correlation Coefficient in StatCrunch

Here is a PDF document with all StatCrunch directions (Links to an external site.).

Flag question: Question 1

Question 110 pts

If you have not done so yet, open the animals data set in the Stats at Cuyamaca College group on StatCrunch (directions - opens in a new tab).

1. Use StatCrunch to create a scatterplot with longevity as the explanatory variable and gestationas the response variable. (directions) Download the StatCrunch output window (your scatterplot) and upload it to your Stats-Class folder in Canvas. Embed the .png file for your scatterplot in the text-box below.
2. Use StatCrunch to produce the correlation coefficient. (directions) Copy the Correlation "text" output and paste it in the text-box below. (directions)