THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

question 91

Multiple Choice

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Independent samples of math scores from students in the U.S.and Europe were collected from normal populations.A sample of 50 students from the U.S.had an average score of 570 while a sample of 50 European students had an average score of 540.The population standard deviations for the average scores of the US and European students are 102 and 115 respectively.
-What is the lower confidence limit of the 95% confidence interval for the difference between the population means?

• A)-24.82
• B)-12.61
• C)-29.21
• D)-18.24