At the .05 significance level, do the data provide evidence of the

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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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At the .05 significance level, do the data provide evidence of the

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