Question

A professor wanted to determine whether an online homework system improved scores on a final exam. In the fall semester, he taught a class using the online homework system (which meant students did their homework online and received instant feedback about their answers along with helpful guidance). I spring semester, he taught a class without the homework system (which meant students were responsible for doing their homework the old-fashioned way - paper and pencil). The professor made sure to teach the two courses identically (same text, syllabus, tests, meeting time, meeting location, and so on). summarizes the results of the two classes on their final exam. Complete parts (a) through (e) below. Click the icon to view the table. (a) What type of experimental design is this? 0 Summary data O A. Retrospective study OB. Prospective study O c. Completely randomized design OD. Randomized blocked design Fall semester Number of students Mean final exam score Standard deviation final exam score (b) What is the response variable? Spring semester 28 66.1 13 29 71.3 10.6 Weather Location OOOO OOOO Test O Text O Syllabus Final exam scores Print Done Teacher Homework system What are the treatments in the study? Select all that apply. Homework system Location Test ロロロロ Final exam scores Text Teacher Weather Syllabus (c) What factors are controlled in the experiment? Select all that apply. ロロロロ Final exam scores Teacher Text Weather Location Homework system Test Syllabus (d) In many experiments, the researcher will recruit volunteers and randomly assign the individuals to a treatment group. In what regard was this done for this experiment? DDDD O A. The assumption is that the students knew about the experiment and choose to be in one of the two classes. OB. The assumption is that the students "randomly" enrolled in the course. OC. The assumption is that the students were selected for each course. OD. No assumptions were made for this experiment.

Answer 1

solution from the given information, we have n=29, 12=28 X = 713, łz=66.1 Si=10.6. Sz=13 The correct aswey fs: Completely Raudomized Block Design CERC In this study, each voft ff randomly acsigned to a treatment. Here the experimental design is complete randomized design. It is observed that there is one response Variable which is final exam score. It is observed that there are two treatments an this study, which is, online and Traditional homework C at as observed that there as 6 factore controlled in this experiment, which is Location, Teachers, Teme, Tests, Syllabus, Text. @at as observed that the researcher will recruit volunteers and randomly assign the individual to a treatment group. In this experiment, the assumption is that the students 'randomly' enrolled in the course.

e ta Tot sta ni 02 71.3–66.1 ta +(1332 df=lho no claim: the students per erform better on the final ena in the fall semester. Nuet hypothesis; Hoi Mean Falspring Alternative hypothesis, ty u Path> Uspring Level of significauce, 230.01 (40-6) 29 28 t = 1.6518 Hence, the test statistic es 11.652 calculate the ht Cou (1333) 10.63131 (13)2 28-1 required degrees of freedom 2 5,22 hil hal 7610.6) (13) 29 28 28 29

Pidf=59.09 Hence, the required probability as (52.89 calculate the p-value. 5.p-value = 0.0485 . The pavalue is greater than significance level 0.01. So, we farl. to repect Ho. #please Rate *