Type of Survey Method - Sampling Method - Coefficient of Correlation - Physics Assignment Help

Assignment Task :

QUESTION 1
Briefly explain 
(a) What type of survey method the researcher could use and why?
(b) What sampling method could the researcher use to select his/her sample and why?
(c) What are the variables the researcher should consider collecting data for the purpose of the analysis and why? Identify the data type(s) for the variables.
(d) What kind of issues the researcher may face in this data collection?

QUESTION 2
First, the researcher wishes to use the graphical descriptive methods to present the data.
(a) The number of observations (N) is 400 families. Calculate the number of classes (K) the researcher should use to construct a histogram for each variable.
(b) He suggests using class intervals such as 0-6, 6-12, 12-18, ... for the TV hours and class intervals 0-30000, 30000-60000, 60000-90000, .... , for the Debt variable. Use appropriate BIN values from these class intervals to draw a histogram for each variable and comment on the shape of the two distributions.
(c) Draw a scatter plot to investigate whether there is a linear relationship between Debt and TV hours. Briefly explain the selection of each variable on the X and Y axes
and why? On the same plot, fit a linear trend line including the equation and the coefficient of determination R

QUESTION 3
Second, the researcher wishes to use the numerical descriptive measures to summarize the data for the two variables debt and TV hours and also analyse the relationship between the two variables..
(a) Prepare a numerical summary report about the data for the two variables (Debt and TV hours) by including the summary measures, mean, median, range, variance, standard deviation, smallest and largest values and the three quartiles, for each variable.
(b) Use five of the above summary measures to represent the summary information in a box plot for each variable. [Either use Data Analysis Plus or hand-draw and
scan the box plot into your assignment.]
(c) Compute the coefficient of correlation to measure the direction and strength of a linear relationship between the two variables. Interpret this value.

QUESTION 4
The researcher considers using regression analysis to establish a linear relationship between the two variables.
(a) What is his dependent variable and independent variable? Why?
(b) Estimate a simple linear regression model and present the estimated linear equation. Interpret the coefficient estimates (intercept and slope) of the linear model.
(c) Find and interpret the coefficient of determination, R-squared (R2) value.

QUESTION 5 
Consider the number of new passenger vehicles sold in Queensland by top sellers of leading manufacturers in 2015 and 2016. The manager wants to compare the sales and market share.
The data are stored in VEHICLES.XLS which is available in the “Assessment” “Assessment 2 - ASSIGNMENT: COMPUTER APPLICATION PROJECT” section of the
AFE135 unit website. Using this data and EXCEL, answer the questions below.
a. Which graphical technique or chart should be used if we are interested in comparing the number of new passenger car sales of the various car models in 2015 and 2016 and why? Construct the chart and describe what you can observe about the number of new passenger car sales in Queensland from the chart.
b. Which graphical technique or chart should be used if we are interested in describing the market share of sales of the various car models in 2015 and 2016 and why? Construct the chart and describe what you can observe about the market share of passenger car models in Queensland from the chart.

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