A random sample of 21 children from the same age group participated in a special language skills program designed to build vocabulary. Measurements at the end of the program showed the children’s...

A random sample of 21 children from the same age group participated in a special language skills program designed to build vocabulary. Measurements at the end of the program showed the children’s vocabularies had a mean of 1060.1 words with a standard deviation of 109.0 words. It is known that the mean vocabulary of children who have taken the special program is greater than 1000 words. Assume that the vocabulary size of children who have taken the program is approximately normally distributed. Conduct a test of hypothesis at the 5% level of significance.

Extracted text: 3. A random sample of 21 children from the same age group participated in a special language skills program designed to build vocabulary. Measurements at the end of the program showed the children's vocabularies had a mean of 1060.1 words witha standard deviation of 109.0 words. It is known that the mean vocabulary of children who have taken the special program is greater than 1000 words. Assume that the vocabulary size of children who have taken the program is approximately normally distributed. Conduct a test of hypothesis at the 5% level of significance.


Extracted text: 3. A random sample of 21 children from the same age group participated in a special language skills program designed to build vocabulary. Measurements at the end of the program showed the children's vocabularies had a mean of 1060.1 words witha standard deviation of 109.0 words. It is known that the mean vocabulary of children who have taken the special program is greater than 1000 words. Assume that the vocabulary size of children who have taken the program is approximately normally distributed. Conduct a test of hypothesis at the 5% level of significance.