Question

5) (a) The mean head circumference of newborn males in the U.S. is 35.83 cm. The head circumferences of 15 males who were later diagnosed with autism spectrum disorder are given below. Is there evidence that head circumference at birth for these males was significantly smaller than normal? 34.8 35.0 36.6 35.9 32.8 33.4 33.3 35.0 34.9 35.2 35.9 34.9 31.8 34.6 33.1 (b) The mean head circumference of one-year-old males in the United States is 46.35 cm. The same group of 15 males was measured at age one year with X- 47.64 cm and s 1.19 cm. Is there evidence that head circumference at one year for these males was significantly larger than normal?

Answer 1

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