An international research claims that the mean age at which children start walking is 13 months. Riana wanted to check if this claim is true in the Philippines. She took a random sample of 14 children and the number of months is shown in the table. Using 5% significance level, can you conclude that the mean age at which all children start walking is different from 13 months. Assume that the age at which all children start walking has an approximately normal distribution.

Table: 12 10 11 9 8 7 14 13 15 16 12 11 13 17