Question: At what age do infants speak their first word of English? Here is the data for 20 children (age in months):

15 26 10 9 15 20 18 11 8 20

7 9 10 11 11 10 12 17 11 10

Do you have good evidence that the mean age at first word among all normal children is greater than 1 year?.

1. State the (H0) and alternative hypotheses (Ha)
2. Calculate the test statistic
3. What are the degrees of freedom?
4. What are the t-values that bracket your test statistic?
5. Find your p-value.
6. Make your final conclusion in words and in terms of the profile calculated p-value. Use 5% significance criteria.

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