statistics : please explain why the answers for 10-11 are correct. And why 12 is wrong

Question 10 1 / 1 pts A researcher wants to examine how a new intervention helps children learn to read. A random sample of 25 kindergarten children is selected from a population with a mean score of 20 on a standardized reading test. After the four week intervention program, the children have an average of 22.2 with a SS of 384. Did the intervention improve reading in kindergarteners? What is the critical value for the test, assuming an alpha of .05? Correct! Question 11 A researcher wants to examine how a new intervention helps children learn to read. A random sample of 25 kindergarten children is selected from a population with a mean score of 20 on a standardized reading test. After the four week intervention program, the children have an average of 22.2 with a $5 of 384. Did the intervention improve reading in kindergarteners? What is the test statistic for the sample? Correct! Question 12 0 l 1 Pts What do you conclude about this sample? The children who participated in the reading intervention had a decrease in reading performance The children who participated in the reading intervention were not signicantly different from the general population on reading performance swer ' The children who participated in the reading intervention had an increase in reading performance