1. The Westminster School District is evaluating the reading program for students in the 7th and 8th grades. The district has scores for 45 randomly selected students who took a Reading Comprehension test in 7th grade and again in 8th grade. The 90% confidence interval for the population mean of the paired differences of scores (8th grade score 7th grade score) was found to be (2.53, 4.53). What can we conclude about the population mean of the paired differences between the 7th and 8th grade test scores? a. With 90% condence, we can conclude that on average, 8'h grade scores are lower than the 7th grade scores by 2.53 to 4.53 points. b. With 90% confidence, we can conclude that on average there is no signicant difference between the 7th and 8\"1 grade scores. c. With 90% condence, we can conclude that on average, 8\"I grade scores are higher than the 7th grade scores by 2.53 to 4.53 points. d. No conclusion