Is There a Genetic Marker for Dyslexia? Exercise 2.20 on page 56 describes a study finding that a gene disruption may be related to an increased risk of developing dyslexia. Researchers studied the gene in 109 people diagnosed with dyslexia and in a control group of 195 others who had no learning disorder. The disruption occurred in 10 of those with dyslexia and in 5 of those in the control group. Are the conditions met to use the normal distribution to estimate the size of the difference in the proportion of those with the gene disruption between those who have dyslexia and those who don’t? Use an appropriate method to estimate the size of this difference, with 95% confidence.

Exercise 2.20

Is There a Genetic Marker for Dyslexia? A disruption of a gene called DYXC1 on chromosome 15 for humans may be related to an increased risk of developing dyslexia. Researchers13 studied the gene in 109 people diagnosed with dyslexia and in a control group of 195 others who had no learning disorder. The DYXC1 break occurred in 10 of those with dyslexia and in 5 of those in the control group.