The ability to read rapidly and simultaneously maintain a high level of comprehension is often a determining factor in the academic success of many high school students. A school district is considering a supplemental reading program for incoming freshmen. Prior to implementing the program, the school runs a pilot program on a random sample of n = 20 students. The students were thoroughly tested to determine reading speed and reading comprehension. Based on a fixed- length standardized test reading passage, the following reading times (in minutes) and comprehension scores (based on a 100-point scale) were recorded.

a. What is the population about which inferences are being made?
b. Place a 95% confidence interval on the mean reading time for all incoming fresh-men in the district.
c. Plot the reading time using a normal probability plot or boxplot. Do the data appear to be a random sample from a population having a normal distribution?

12 3 4 5 6 7 8 9 10 1 12 13 14 15 16 17 18 19 20 n ys Student Reading Time 5 7 15 12 8 7 10 9 13 10 6 11 8 10 8 7 6 11 8 20 9.10 2.573 Comprehensin 60 76 76 90 81 75 95 98 88 73 90 66 91 83 100 85 76 69 91 78 20 82.05 10.88