Abbot Milk Company conduct a study about child growth and the relationship with milk consumption daily. Children that stay in an urban area might have better growth because their parent can afford to buy milk everyday compare to those stayed in rural area. To test the claim, they measured the heights of 36 children from urban area and obtained a mean of 92.8 cm. The population of children has heights with a mean of 91.4 cm and a standard deviation of 3.6 cm (based on annual report). Use a 0.05 significance level to test the claim that children from urban area have a mean height different from 91.4 cm.

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