Statistics for The Behavioral Sciences (MindTap Course List)
Statistics for The Behavioral Sciences (MindTap Course List)
10th Edition
ISBN: 9781305504912
Author: Frederick J Gravetter, Larry B. Wallnau
Publisher: Cengage Learning
bartleby

Videos

Textbook Question
Book Icon
Chapter 18, Problem 20P

In Problem 14 in Chapter 11, we described a study Showing that students are likely to improve their test

Scores if they go back and change answers after reconsidering some of the questions on the exam (Johnston, 1975). In the study, one group of students was encouraged to reconsider each question and

to change answer whenever they felt it was appropriate ate. The students were asked to record their original answers as well as the changes. For each student, the exam was graded based on the original answers and on the changed answers. For a group of n = 40 students

oppose that 26 had higher scores for the changed­ answer version and only 14 had higher scores for

the original-answer version. Is this result significantly

different from chance? Use a two-tailed test with a = .01.

There is some evidence suggesting that you are likely to improve your test score if you rethink and change answers on a multiple-choice ex am, (Johnston, 1975). To determine this phenomenon a teacher gave the same final exam to two section of a psychology course. The students in one section were told to tum in their exams immediately after finishing, without changing any of their answer. In the other section, students were encouraged to reconsider each question and to change answers whenever they felt it was appropriate. Before the final exam, the teacher had matched 9 students in the first section with 9 students in the second section based on their midterm grades. For example, a student in the no-change section with an 89 on the midterm exam was matched with student in the change section who also had an 89 on the midterm. The difference between the two final exam grades for each matched pair was computed and the data showed that the students who were allowed to change answers scoring higher by an average of MD = 7 point With SS = 288.

  1. Do the data indicate a significant difference between the two conditions? Use a two-tailed test with a = .05.
  2. Construct a 95% confidence interval to estimate the size of the population mean difference.

  • Write a sentence demonstrating how the result of the hypothesis test and the confidence interval would appear in a research report.
  • Blurred answer
    Students have asked these similar questions
    Joy is making Christmas gifts. She has 6 1/12 feet of yarn and will need 4 1/4 to complete our project. How much yarn will she have left over compute this solution in two different ways 
    Solve for X. Explain each step. 2^2x • 2^-4=8
    One hundred people were surveyed, and one question pertained to their educational background. The results of this question and their genders are given in the following table.   Female (F) Male (F′) Total College degree (D) 30 20 50 No college degree (D′) 30 20 50 Total 60 40 100 If a person is selected at random from those surveyed, find the probability of each of the following events.1. The person is female or has a college degree. Answer: equation editor Equation Editor 2. The person is male or does not have a college degree. Answer: equation editor Equation Editor   3. The person is female or does not have a college degree.
    Knowledge Booster
    Background pattern image
    Statistics
    Learn more about
    Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.
    Similar questions
    SEE MORE QUESTIONS
    Recommended textbooks for you
    Text book image
    Holt Mcdougal Larson Pre-algebra: Student Edition...
    Algebra
    ISBN:9780547587776
    Author:HOLT MCDOUGAL
    Publisher:HOLT MCDOUGAL
    Text book image
    Glencoe Algebra 1, Student Edition, 9780079039897...
    Algebra
    ISBN:9780079039897
    Author:Carter
    Publisher:McGraw Hill
    What Are Research Ethics?; Author: HighSchoolScience101;https://www.youtube.com/watch?v=nX4c3V23DZI;License: Standard YouTube License, CC-BY
    What is Ethics in Research - ethics in research (research ethics); Author: Chee-Onn Leong;https://www.youtube.com/watch?v=W8Vk0sXtMGU;License: Standard YouTube License, CC-BY