One of the most striking human accomplishments is the achievement of intelligible speech by age five. Males generally develop at a slower rate than females, and in a recent large study of speech development in young children, investigators hypothesized that a greater proportion of boys would have speech deficits for this reason. Random samples of healthy two-year-old males and females were followed over the course of a year, and at age 3 each child was classified as having a speech deficit or not. The data are given in the table below:
Speech delay and gender at 3 years old
|
Gender |
Female |
Male |
Total |
|
Speech deficit |
22 |
78 |
100 |
|
No Speech Deficit |
280 |
259 |
539 |
|
Total |
302 |
337 |
639 |
At the .05 significance level, do the data provide evidence of the hypothesized developmental differences?
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