A scientist who studies sleep has developed a new technique to help people sleep each night. He is conducting a study of 100 people and wants to determine if there is significant difference in people's amount of sleep before using the technique compared to after using the technique. Which of the following describes the scientist's null and alternative hypotheses?
1. null hypothesis: Up = 0; alternative hypothesis: 4p 70
2. null hypothesis: Lo + 0; alternative hypothesis: 4p = 0
3. null hypothesis: 4 - 4y = 0; alternative hypothesis: 44-470
4. null hypothesis: 44-42 +0; alternative hypothesis: 44-42 = 0