Door-to-Dorm Laundry Service

You have decided to start a door-to-dorm laundry service for the college students at the local university. Students log on to your Web site and provide specific information to create an account including address information needed for pickup and delivery plus credit, charge, or debit card information for payment. At the time of the initial pickup, students are given a large plastic bag that they fill with their laundry. You pick up the laundry and wash, dry, fold, and return it within one week. Once the student has created an account, they can text, email, or logon on to the Web site to request future pickups.

Review Questions

1. Define the basic functions that this Web site must perform in order to meet the basic needs of the laundry service as well as attract and maintain the interests of students. What are some things you might do to entice students to return time and time again to your Web site?
2. What actions can you take to increase traffic and draw students to your Web site?
3. Submit the assignment to Dropbox.

Critical Thinking Questions

1. Can you identify additional laundry-related services that might be added to your basic wash, dry, and fold offering that would be attractive to students? How could the initial Web site design allow for these potential opportunities?
2. What steps might you take to personalize the Web site so that the students feel welcome each time they visit?
3. Submit the assignment to Dropbox.

A statistics student who is curious about the relationship between the amount of time students spend on social networking sites and their performance at school decides to conduct a survey. Three research strategies for collecting data are described below. In each, name and discuss the sampling method proposed and any bias you might expect.

He randomly samples 300 students from the study's population, gives them the survey, asks them to fill it out and bring it back the next day. (1 mark).

He gives out the survey only to his friends, and makes sure each one of them fills out the survey. (1 mark).

He posts a link to an online survey on his Facebook wall and asks his friends to fill out the survey. (1 mark).

Victoria University has 1200 students undertaking the unit Introduction to Marketing this semester across three campuses with 900 students enrolled at the Melbourne City Campus, 200 students at the Sydney Campus and 100 students at the Sunway Campus. All lecture notes, teaching and supporting materials are uploaded on the VUCollaborate. The lectures are conducted by three different local lecturers at these campuses. The researcher wants to conduct a survey of 300 students about how satisfied the students are with the unit, and he believes that the campus a student is enrolled at might affect the student’s overall satisfaction with the unit.

Suggest the most appropriate sampling strategy for carrying out this study and any bias you might expect from it. .

An education researcher is interested in students’ performance on a standardised reading test. The researcher believes that if students experience a particular form of positive coaching, then they will be more likely to perform better on the reading test.

This researcher is testing two hypotheses. The first is that the coaching boosts self-efficacy and has an effect on students’ reading test scores. The second is that this treatment effect is moderated by year in school. Past research has suggested that there should not be a main effect for school year. However, to control for this possibility, a 2-way (2x2) factorial ANOVA is being conducted to account for any influence from school year, the treatment, and the interaction of the two main effects.

To test the hypotheses, the research has obtained 28 participants: 14 year-7 students and 14 year-10 students. From each group of 14, 7 students were randomly chosen for the treatment group. After the treatment, all students were given the same test. This test has been used in previous research, has a range of 0 to 100, and measures students’ reading comprehension. (The higher the test score, the more positive the result.)

Use a 2x2 ANOVA with α=0.01α=0.01 to test the the data and evaluate the hypotheses. Results are provided below for each group of students.

( 1a ) What is the F value for the treatment effect?  
(Report answer accurate to 2 decimal place.)

( 1b ) What is the p-value for the F value for the treatment effect?  
(Report answer accurate to 4 decimal places.)

( 1c ) Does this support the researcher's hypothesis that the treatment has an effect on reading comprehension?

• yes
• no

( 2a ) What is the F value for the school-year effect?  
(Report answer accurate to 2 decimal place.)

( 2b ) What is the p-value for the F value for the school-year effect?  
(Report answer accurate to 4 decimal places.)

( 2c ) Does this support the researcher's assumption that school-year does NOT have an effect on reading comprehension?

• yes
• no

( 3a ) What is the F value for the interaction effect?  
(Report answer accurate to 2 decimal place.)

( 3b ) What is the p-value for the F value for the interaction effect?  
(Report answer accurate to 4 decimal places.)

( 3c ) Does this support the researcher's hypothesis that the treatment effect is moderated by school-year?

• yes
• no

( 4 ) Based on these findings, which group can you say had the higher average on the test?

• year-7 students
• year-10 students
• group with no coaching
• group with positive coaching
• year-7 students in the control group
• year-10 students in the control group
• year-7 students in the treatment group
• year-10 students in the treatment group

---In the code, create add and delete a student by ID number when prompted

///////////////////////////////////////////////////////////////

import java.util.Scanner;

public class COurseCom666 {
    private String courseName;
    private String [] students = new String[1];
    private int numberOfStudents;

    public COurseCom66(String courseName) {
        this.courseName = courseName;
    }
    public String[] getStudents() {
        return students;
    }
    public int getNumberOfStudents() {
        return numberOfStudents;
    }
    public String getCourseName() {
        return courseName;
    }

    public void addStudent(String student) {
        // Automatically increases the array size
        if (numberOfStudents == students.length) {
            String[] a = new String[students.length + 1];
            for (int i = 0; i < numberOfStudents; i++) {
                a[i] = students[i];
            }
            students = a;
        }
        students[numberOfStudents] = student;
        numberOfStudents++;
    }
    public String[] addStudentByIndex(String student,int index){
        String [] a = new String[students.length+1];
        if (numberOfStudents == students.length){

            for (int i = 0; i < a.length;i++){
                if(i < index){
                    a[i] = students[i];
                }
                else if (i == index ){
                    a[i] = student;
                }
                else{
                    a[i] = students[i-1];
                }}
        }
        numberOfStudents++;
        return a;
    }
    public static void display(String[]students){
        System.out.println("========================");
        System.out.print("Now the New students Array is :\n");
        for(int i=0; i<students.length; i++)
        {
            System.out.println("Index: "+(i)+"--> "+ students[i]+" ");
        }
    }

    public String [] removeStudentByIndex(String [] a, int index){
        //find the index of student
        String [] b = new String[a.length-1];
        students = a;
        // int position = findStudent(student);
        for (int i = 0,k=0; i < a.length;i++){
            if (i == index){
                continue;
            }
            else{
                b[k++] = a[i];
            }
        }
        numberOfStudents--;

        return b;

    }
    private int findStudent(String student) {
        for (int i = 0; i < numberOfStudents; i++) {
            if (students[i].equals(student)) {
                return i;
            }
        }
        return -1;
    }
}

import java.util.Scanner;

public class d {

    public static void main(String[] args) {
        COurseCom666 com666 = new COurseCom666("com666");
        com666.addStudent("bishal");
        com666.addStudent("ana");
        com666.addStudent("ying");
        com666.addStudent("samuel");
        com666.addStudent("surai");

        int sum = 0;
        ////////create a new array String students1[] to hold all students/////////////////////
        String students1[] = com666.getStudents();

        sum += com666.getNumberOfStudents();
        Scanner scan = new Scanner(System.in);

        int choice;

        do {
            System.out.println("Welcome to College");
            System.out.println("1. View Student");
            System.out.println("2. Insert Student");
            System.out.println("3. Remove student");
            System.out.println("4. Exit");
            choice = scan.nextInt();
            if (choice == 1) {
                for (int i = 0; i < students1.length; i++) {
                    System.out.println("Index is: " + (i) + "---> " + students1[i]);
                }
                System.out.println("Number of students attending the Course is: " + sum);
            }
            else if (choice == 2) {
                System.out.println("Enter the name of student abd index: ");
                scan.nextLine();
                String student = scan.nextLine();
                students1 = com666.addStudentByIndex(student, 3);
                com666.display(students1);

                sum = com666.getNumberOfStudents();
                System.out.println("After student was added number is: " + sum);
            }
            else if (choice == 3) {
                System.out.println("Remove student by index");
                int index = scan.nextInt();
                students1 = com210.removeStudentByIndex(students1, index);
                com666.display(students1);
                sum = com666.getNumberOfStudents();
                System.out.println("After student drop number is: " + sum);
                System.out.println("Number of students attending the Course is: " + sum);
                System.out.println("----------------------------------");
            }
        }
        while (choice!= 4);
    }
}

An education researcher is interested in students’ motivation to study local history. The researcher believes that if students experience a particular form of positive coaching, then they will be more likely to show interest in local history.

This researcher is testing two hypotheses. The first is that the coaching boosts self-efficacy and has an effect on students’ motivation. The second is that this treatment effect is moderated by year in school. Past research has suggested that there should not be a main effect for school year. However, to control for this possibility, a 2-way (2x2) factorial ANOVA is being conducted to account for any influence from school year, the treatment, and the interaction of the two main effects.

To test the hypotheses, the research has obtained 28 participants: 14 year-7 students and 14 year-10 students. From each group of 14, 7 students were randomly chosen for the treatment group. After the treatment, all students were given the same test. This test has been used in previous research, has a range of 0 to 100, and measures students’ interest in issues relating to local history. (The higher the test score, the more positive the result.)

Use a 2x2 ANOVA with α=0.02α=0.02 to test the the data and evaluate the hypotheses. Results are provided below for each group of students.

( 1a ) What is the F value for the treatment effect?  
(Report answer accurate to 2 decimal place.)

( 1b ) What is the p-value for the F value for the treatment effect?  
(Report answer accurate to 4 decimal places.)

( 1c ) Does this support the researcher's hypothesis that the treatment has an effect on interest in local history?

• yes
• no

( 2a ) What is the F value for the school-year effect?  
(Report answer accurate to 2 decimal place.)

( 2b ) What is the p-value for the F value for the school-year effect?  
(Report answer accurate to 4 decimal places.)

( 2c ) Does this support the researcher's assumption that school-year does NOT have an effect on interest in local history?

• yes
• no

( 3a ) What is the F value for the interaction effect?  
(Report answer accurate to 2 decimal place.)

( 3b ) What is the p-value for the F value for the interaction effect?  
(Report answer accurate to 4 decimal places.)

( 3c ) Does this support the researcher's hypothesis that the treatment effect is moderated by school-year?

• yes
• no

( 4 ) Based on these findings, which group can you say had the higher average on the test?

• year-7 students
• year-10 students
• group with no coaching
• group with positive coaching
• year-7 students in the control group
• year-10 students in the control group
• year-7 students in the treatment group
• year-10 students in the treatment group

An AC power supply produces a maximum voltage ΔVmax = 88 V. This power supply is connected to a resistor R = 27.0 Ω, and the current and resistor voltage are measured with an ideal AC ammeter and voltmeter as shown in the figure below. An ideal ammeter has zero resistance, and an ideal voltmeter has infinite resistance.

(a) What is the reading on the ammeter?
A

(b) What is the reading on the voltmeter?
V

You are given the following data:
Year            sales            profit
2018           GHc 120, 000       8000
2019           GHc 140, 000       13,000
Find out:
i.   P/V ratio
ii.   Break-even point
iii.   Profit when sales are GHc 180,000
iv.   Sales required to earn a profit of GHc 12,000
v.   Margin of safety in year 2019.

A damaged car battery with an emf of 11.4 V and an internal resistance of 0.01 ohms is connected to a load of 2.0 ohms. To help the battery, a second battery with an emf of 12.6 V and an internal resistance of 0.01 ohms is connected by jumper cables to the terminals of the first battery.

1. Draw a diagram for the circuit.
2. Find the current in each part of the circuit.
3. Find the power delivered by the second battery.

What are the restrictions in naming variables and script files in Matlab?

What is the difference between the operators * and .*

What is the function of the commands help, who, and logspace?

Consider the Van der Waals Equation of State for modeling the P-V-T behavior of gases.

.

Suppose a= 3, b=4, V=5; R=8.3, T=400. Write a Matlab code to compute p.