Question: Please please please sir answer 2. A researcher claims that the mean age at which children start walking is 12 months. However, a sample of

Please please please sir answer 2. A researcher claims that the

Please please please sir answer

2. A researcher claims that the mean age at which children start walking is 12 months. However, a sample of 15 children showed that the mean age at which they started walking was 14 months. The previous record showed that the standard deviation age is three months. Test at the 1% significance level if the mean age at which all children start walking differs from 12 months

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