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Mathematics, 16.03.2020 18:55 jos0305

A study reported that the average age of menarche of girls entering the first year class of a small American private college in the year 2008 was 11.89. Suppose you want to test whether the age of menarche of the girls in your class is different. After randomly selecting 30 girls and recording their menarche age, we find that this sample of girls were at the average age of 12.98 years old, with a 95% confidence interval from 11.59 year-old to 13.31 year-old. Based on this interval, should you reject or fail to reject the hypothesis that the menarche age of girls in you class is 11.89 on average

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