questions to In a sim be answered while studying for the final exam. The overall average for the exam was 73.4 but the n 16 students who answered questions had a mean of M 78.3 with a standard deviation of o = 8.4.For this study, did answering questions while studying produce significantly higher exam scores? Use a one- ogy class gave one group of ng tailed test with a = .01. 17. Ackerman and Goldsmith (2011) found that students who studied text from printed hardcopy had better test presented scores than students who studied from text on a screen. In a related study, a professor noticed that sev- eral students in a large class had purchased the e-book version of the course textbook. For the final exam, the overall average for the entire class was u 81.7 but the n = 9 students who used e-books had a mean of M 77.2 with a standard deviation of s 5.7 a. Is the sample sufficient to conclude that scores for students using e-books were significantly different from scores for the regular class? Use a two-tailed AC g0g test with o = .05. TICONDEROGA h. Construct the 90% confidence interval to estimate the mean exam score if the entire population used dw nobi c. Write a sentence demonstrating how the results from the hypothesis test and the confidence inter- val would appear in a research report. e-books. 18. A random sample of n = 16 scores is obtained from a population with a mean of u = 45. After a treatment Is administered to the individuals in the sample, the sample mean is found to be M = 49.2. nt the camnle standard deviation is d to