Researchers Want to Know If Reading Skills Can Explain IQ

Multiple Choice

Researchers want to know if reading skills can explain IQ test scores in children with dyslexia. The following scatterplot examines the relationship between reading skill score and IQ test score for 22 dyslexic children. The least-squares regression line is displayed on the plot, along with the value of r².
Here is software output for predicting IQ test score when reading skill score = 80:
$$\begin{array} { l l l l l } \text { Obs } & \text { Fit } & \text { SE Fit } & 95 \% \text { CI } & 95 \% \text { PI } \\80.0 & 94.59 & 2.94 & ( 88.46,100.71 ) & ( 69.44,119.74 ) \end{array}$$ What is the best description of the interval (69.44, 119.74) ?

A) 95% confidence interval for the IQ test score of a dyslexic child with a reading skill score of 80
B) 95% prediction interval for the IQ test score of a dyslexic child with a reading skill score of 80
C) 95% confidence interval for the mean IQ test score of all dyslexic children with a reading skill score of 80
D) 95% prediction interval for the mean IQ test score of all dyslexic children with a reading skill score of 80