Chapter 3.1, Problem 13E

To determine

To investigate:the relationship between breeding pairs and percent return.

Answer to Problem 13E

The overall pattern moves from upper left to lower right.

The form of the relationship is linear.

The relationship is moderately strong

Explanation of Solution

Given:

Breeding pairs:	Percent return:
$28$	$82$
$29$	$83$
$29$	$70$
$29$	$61$
$30$	$69$
$32$	$58$
$33$	$43$
$38$	$50$
$38$	$47$

Follow the four-step process.

Calculation:

Using Excel, the scatter plot for the given data is shown below:

  

From the above figure the overall pattern moves from upper left to lower right. That is, lower percent return tends to have higher breeding pairs. We call this a negative association between the two variables. The form of the relationship is linear. That is, the overall pattern follows a straight line from upper left to lower right. The relationship is moderately strong because the points don’t deviate greatly from line but there is one outlier (lower right).

If the number of breeding pairs in an isolated area is higher, lower the percent of males (branded for identification) that returned the next breeding season.

Conclusion:

The overall pattern moves from upper left to lower right.

The form of the relationship is linear.

The relationship is moderately strong