Research Methods and Design I – Short Assignment #7 – Crazy Correlations

This individual assignment is related to your Chapter 5 (Salkind) material.

Below is a scatterplot between two variables – “Alcohol Consumption” and “Academic Performance.” Fill in the data table (Participant #1 through #20)! I’ll give you the academic performance score, so just make sure to find the corresponding alcohol consumption score using the scores on the X-axis of the chart below.

2). Does there appear to be a correlation between these two variables? If yes, is it a direct correlation (positive) or indirect correlation (negative)?

3). Calculate the specific correlation coefficient for this data. What does r =

4). What are three possible explanations for this correlation? (Note – These can include “third variable” explanations)

5) ). Now design an experimental study to investigate these two variables. What is your hypothesis? What type of hypotheses does the experimental method allow you to test that the correlational method does not? (Note: You can disregard ethical limitations here! Just design an experimental study rather than a purely correlational study). For the study you design, what is your independent variable? What is your dependent variable? How did you operationally define your variables here?

In C++, Complete the Code & Show the output.

Schedule the following process using Shortest Job First Scheduling algorithm

Compute the following and show the output

a) Individual Waiting time & Turnaround time

b) Average Waiting time & Turnaround time

c) Display the Gantt chart (Order of Execution)   

#include

using namespace std;

//structure for every process

struct Process {

int pid; // Process ID

int bt; // Burst Time

int art; // Arrival Time

};

// Soring Process based on Burst Time Descending Order

void sort(Process a[],int n) {

//-------------Sorting

// Write Code Here

}

// function to find the waiting time for all processes

void WaitingTime(Process proc[], int n, int wt[])

{

// Write Code Here

}

// function to calculate turn around time

void TurnAroundTime(Process proc[], int n, int wt[], int tat[])

{

// Write Code Here

}

int main() {

const int n=4;

Process proc[] = { { 1, 8, 0 },

{ 2, 2, 0 },

{ 3, 1, 0 },

{ 4, 4, 0 } };

int wt[n], tat[n], total_wt = 0,total_tat = 0;

// Sort Processes based on Burst Time

sort(proc,n);

// Function to find waiting time of all processes

WaitingTime(proc, n, wt);

// Function to find turn around time for all processes

TurnAroundTime(proc, n, wt, tat);

// Write Code Here

cout<<"\n\nOrder of Execution ";

for (int i = 0; i < n; i++) {

cout<<"P"<";

}

return 0;

}

1 - Briefly describe overflow. When does it occur?

2 - Briefly describe underflow. When does it occur?

3 - What decimal number does the bit pattern 1101 1011 represent if it is a:

• unsigned integer?

• sign-magnitude integer?

• two's complement integer?

4 - What decimal number does the bit pattern 0011 1011 represent if it is a:

• unsigned integer?

• sign-magnitude integer?

• two's complement integer?

5 - What is the binary representation of the decimal number 28 assuming the IEE 754 single precision format?

6 - What decimal number does the bit pattern 0xBF800000 represent if it is:

• A two's complement integer?

• An unsigned integer?

• A floating point number assuming the IEE 754 single precision format

7 - Perform the following calculations assuming that the values are 4-bit decimal integers stored in two's complement format. Be sure to consider the possibility of overflow.

• 1101 + 0011

• 1101 – 0011

8 – For the following operations: write the operands as 2's complement binary numbers then perform the addition or subtraction operation shown. Show all work in binary operating on 4-bit numbers.

• 4 + 2

• 4 - 2

• 2 - 4

Write a program in java that detects if there is a cycle in an undirected graph using DFS

Two lines of input:

1. Two integers V for the number of vertices and E for the number of edges respectively.

2. List of integers that shows how the graph is connected.

Ex input:

4 4

01020323

Output:

Graph contains cycle

Ex input:

5 4

01020314

Output:

Graph doesn't contains cycle

1. Add the following binary numbers in 4-bit, two's complement notation. Identify any overflow errors. 01102 + 01002

2.Add the following binary numbers in 4-bit, two's complement notation. Identify any overflow errors. 10102 + 11112

3.Add the following binary numbers in 4-bit, two's complement notation. Identify any overflow errors. 10112 + 01112

In Activity-Based Costing,

1. Briefly discuss the features of your chosen costing system.
2. Identify 2 specific Australian organisations that your chosen costing system is suitable to, and explain why.
3. Discuss the potential uses of the cost information for decision-making, to the managers in each of the 2
organisations selected in Q2 above.

(Make it Detailed)

There are 2 assets. Asset 1: Expected return 7.5%, standard deviation 9% Asset 2: Expected return 11%, standard deviation 12%, correlation with asset 1 is 0.4 You hold 30% of your portfolio in asset 1 and 70% in asset 2. a) (1 point) What is the expected return of your portfolio? b) (1 point) What is the covariance between assets 1 and 2? c) (1 point) What is the standard deviation of your portfolio?

On the overlap of two events, suppose two events A and B , P(A)=1/2, P(B)=2/3, but we have no more information about the event, what are the maximum and minimum possible values of P(A/B)

Consider the differential equation dy/dx = y^2 + y - 2 (1) Sketch its phase portrait and classify the critical points. (2) Find the explicit solution of the DE.