Posted: March 6th, 2021

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

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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