1. A social psychologist hypothesized that a factor in juvenile delinquency was the presence or absence of a strong father-figure in the home. He examined the folders of 100 inmates in the federal reformatory and found that only 50 of these young men grew up with a strong father-figure in the home. He also examined the records of 100 randomly selected male college students and found that 70 of them had strong father-figures in their boyhood homes. Use the chi square method to test the psychologist’s hypothesis.2. A labor official predicted that the following percentages of makes of cars would be seen passing a picket line at an automobile plant where a strike was in progress.General MotorsFordChryslerForeign Brand38%28%24%10%The following numbers of cars were counted. Analyze the data and write a conclusion about the official’s prediction.General MotorsFordChryslerForeign Brand1147275413. On a test of independence between alcoholism and early toilet training, a clinical researcher found a2 = 6.48. With df = 1 and  = .05, write a conclusion about the relationship between the two variables.4. A mathematical learning theory predicted the percentages of nine different outcomes. The data were gathered, producing a 2 = 6.79 was found. Interpret the results in terms of the adequacy of the theory.5. A 6 x 8 test of independence produced a chi square of 10.42. Write a conclusion about the inde- pendence of the two variables under consideration.6. In an activity wheel, experimental animals were either isolated or put together and maintained on a restricted feeding schedule. After 25 days, the animals were either alive with stabilized weights or they were dead. Test for the independence of these two conditions with a 2 test. Use an  = .01.Isolated TogetherAlive98Dead1127. In a 3 x 5 test of independence, a 2 = 10.61 was calculated. Write a conclusion.8. A theoretical model predicted the percentage of responses among six categories of response. On a test each person was counted in one of the six possible categories. A 2 = 12.10 was calculated. Write a conclusion about the theory.9. At a busy street corner in a large city, right at the morning rush hour, a psychologist counted the number of people waiting for the light to change. A confederate dressed as a homeless man crossed the street against the light. The psychologist counted the number of people who followed him. When the next group collected to wait for the light to change, another confederate, dressed as a well-to-do businessman, crossed the street against the light, and the psychologist counted the number of people who followed him. Analyze the data.Followed Did Not FollowHomeless Man315Businessman87What can the psychologist say about the influence of appearance on whether or not a person takes risks?10. a. Children were asked if they brushed their teeth regularly and, if so, with what brand of toothpaste. Children with dental caries (cavities) were identified. A statistician collected the records of children who brushed regularly and divided them into four categories of toothpaste. Brand A-185 records; Brand B – 210; Brand C – 150; and all others, 105. Each of these four sets was then divided into children who had caries and those who did not. The results were: A, 38 with caries, 147 without; B, 45 with caries, 165 without; C, 32 with caries, 118 without; others, 30 with caries, 75 without. Analyze the data and write a conclusion.b. Suppose that of the 325 children who reported they didn’t brush regularly, 40% had caries. Use this fact and the data in 10a to determine if brushing is related to dental health.

Calculate ROI Program Prior to beginning work on this assignment read What is ‘Return on Investment – ROI’ (Links to an external site.). Review Chapter 1 in Data Structures Essentials, as well as the following web pages from Week 3: Data Structure – Linked List (Links to an external site.); Java Examples – Get Elements of a LinkedList (Links to an external site.); Java – The LinkedList Class (Links to an external site.); Lesson: Implementations (Links to an external site.); List Implementations (Links to an external site.); and The List Interface (Links to an external site.). Students: Be sure to download and save a PDF version of your textbook for future reference. It will be used in later courses within your program, including the final, capstone course. Zybooks limits online access to your course textbooks to a 12-month period. (Zybook Download Instructions download) For this assignment, you will take on the role of a member of an IT department. Your chief technology officer (CTO) has tasked your department with the replacement of IT equipment. Your manager does not want to buy a piece of equipment based on the brand name alone. Rather, your manager wants to know the return on investment for each piece in order to make a sound purchasing decision. Your task is to write a Java program that will be used to calculate ROI on three different pieces of equipment and sort it from best to least ROI. The program must prompt the user to enter the brand name of the equipment, the gain, and the cost for each piece of equipment. In this coding assignment, you will express searching and sorting algorithms to return the ROI best to least for each piece of equipment. You must apply algorithmic design techniques in developing your program so that you can ensure the user will receive a correctly sorted list. Utilize a LinkedList class to create the list. Include comments for each section of the program. You may select variable names as long as proper Java syntax is used. You will also submit your source code in a zip file. Utilize a Java LinkedList to input the brand name of the equipment along with the equipment’s corresponding gain and cost. The input should be completed by the user either via keyboard or via file. As a last resort, the data can be hard-coded into the program. The input for this calculation is in the Gains and Costs for Equipment downloadtable. Utilize the ROI calculation (below) with the data from the LinkedList. You may select any of the sorting algorithms from Chapter 1 of Data Structures Essentials to sort the ROI from best to least return. The calculation for Return on Investment Calculation (ROI) is as follows: ROI = (Gain from Investment – Cost of Investment) / Cost of Investment Sort from the best to least ROI, and display to the screen the equipment name, gain, cost, and calculated ROI. The program must include the code to inform the user that the program has completed processing. Your code must include the following as comments at the top of the code: Name of program Author/student’s name Course name and number Instructor’s name Date submitted Take a screen shot of the results page and save the image. When you are finished with your Java program, zip the file(s). Next, submit the zip folder that contains the running source code to the Week 5 Zip File Submission page.  If you need more guidance, review the Zip File Quick Start Guide download. Be sure that you are sharing the zip folder with your instructor only. Your instructor will run your source code to ensure that the functionality runs correctly.