Chapter 3.1, Problem 32E

To determine

To find: the correlation for the remaining 13 points

Answer to Problem 32E

Option d is correct.

Explanation of Solution

Given:

1. -0.95
2. -0.5
3. 0
4. 0.5
5. 0.95

Calculation:

The given figure shows the scatterplot of reading test scores against IQ test scores for 14 fifth-grade children. From the scatterplot we can clearly see that point with IQ = 124 and reading = 10 is an outlier. This point falls outside the overall pattern. If we remove this outlier, the reaming 13 points move from lower left to upper right. That is, child with higher test score gets higher reading test score also. We call this a positive association between the two variables. The form of the relationship is linear. That is the overall pattern follows a straight line form lower left to upper right. The relationship is moderately strong. The correlation is 0.5