Please provide complete work for entire question.

2. A study was conducted of the effects of a special class designed to aid students with verbal skills. Each child in a sample of 144, was given a verbal skill test twice, both before and after completing a 4-week period in the class. The average score before the class was 590, and after was 589. With the standard deviation of 105. Was the class effective and did the average score change? (Hint: the null can be the before pre-class average, and you can test if the after-sample average provides enough evidence to reject the pre-class average.)