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According to a study of 250 families from medium and high socioeconomic strata, children begin some oral health care practice at 15.6 months. is known

According to a study of 250 families from medium and high socioeconomic strata, children begin some oral health care practice at 15.6 months. is known that the standard deviation is 8.5 months. Find a 98% confidence interval for The starting age of oral dental care practices for children from families of economic strata medium and high socioeconomic

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