A psychologist claims that the mean age at which children start walking is 12.5 months. Carol wanted to check if the claim is true. She took a random sample of 18 children and found that the mean age at which these children started walking was 12.9 months with a standard deviation of 0.8 months. It was known that the ages at which all children start walking are approximately normally distributed. Test Carol's claiming using a 2% level of significance.

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A psychologist claims that the mean age at which children start walking is 12.5 months. Carol wanted to check if the claim is true. She took a random sample of 18 children and found that the mean age at which these children started walking was 12.9 months with a standard deviation of 0.8 months. It was known that the ages at which all children start walking are approximately normally distributed. Test Carol's claiming using a 2% level of significance.

  With this problem, I am specifically confused on the very first part - of writing this statement symbolically, and in knowing how to formulate H0 and H1.

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