Business and Economic Statistics Essays

Business and Economic Statistics Essays Business and Economic Statistics Essay Business and Economic Statistics Essay ECMT1010 BUSINESS AND ECONOMIC STATISTICS A ASSIGNMENT Semester 1, 2011 This assignment is worth 10% of your total mark. It must be handed in by 4:30pm on Friday, 3 June in the marked drop-off boxes in the Merewether building (Level 2, reception area). Late assignments will not be accepted and will result in a zero mark. The assignment must be done individually and plagiarism will result in severe penalty and possibly a zero mark. The assignment will be marked out of 50. Marks for each question are shown. Data for analysis: Suppose that you are working for an environmental group on household electricity consumption. You are primarily interested in quantifying what factors could affect the household electricity consumption. The environmental group provided a data set that contained the information of 50 randomly selected households in Western Sydney. The data are recorded in an EXCEL file that you can download from the course web site. Q1a (8 marks) The leader of the environmental group suspects that homes (referred to as population 1) consume more electricity than units (referred to as population 2). Perform a hypothesis test to validate such suspicion. You must clearly state your null and alternative hypothesis, your conclusions, and the related output that lead to your conclusions. Use ? =0. 05 and assume unequal variances. Q1b (8 marks) However, the test in Q1 does not take the size of the building into considerations. So you compute the electricity consumption per week per square meter. We call this the electricity consumption rate. Perform a hypothesis to verify if the electricity consumption rate of homes is higher than that of units. You must clearly state your null and alternative hypothesis, your conclusions, and the related output that lead to your conclusions. Use ? =0. 05 and assume unequal variances. Q1c (4 marks) Based on your analysis in Q1a and Q1b, is it true that homes consume more electricity than units? Q2 (25 marks) You decide to run a simple linear regression using the electricity consumption as the dependent variable and the size of the building as the independent variable (use all 50 samples). a) Estimate the regression equation between these variables, showing all relevant estimation output, i. e. estimates, t-statistics, p-values, etc. ) State and interpret the R2 value from this regression fit and comment on the strength of the relationship. c) Examine the residuals from your regression. Are the assumptions of a simple linear regression model satisfied? (Hint: you might enlist all the related assumptions and perform related test one by one. ) d) A new home with 180 square meters is completed. Construct a 90% prediction interval of the electricity consumption per week. Q3 (5 marks) Give a summary of your conclusions about the relationship among electricity consumption, square meters, and types of building. END OF ASSIGNMENT

Tisiphone the Greek Goddess

Tisiphone the Greek Goddess Tisiphone is one of the Furies or Erinyes in Greek mythology. Tisiphone is the avenger of murder. Her name means voice of revenge. The Erinyes were formed when the blood of Uranus fell on Gaia when the son of Uranus, Cronus, killed him. The Furies pursued particularly heinous criminals and drove them mad. Their most famous victim was Orestes, whose crime was matricide. The names of the other Erinyes were Alecto and Megaera. Characteristics In the Eumenides, the tragedy by Aeschylus about the Erinyes and Orestes, the Erinyes are described as dark, not quite women, not quite Gorgons (Medusas), featherless, with rheumy eyes and partial to blood. (The Appearance of Aeschylus Erinyes, by P. G. Maxwell-Stuart. Greece Rome, Vol. 20, No. 1, pp. 81-84) Jane E. Harrison (September 9, 1850 - April 5, 1928) says the Erinyes at Delphi and elsewhere were ancestral ghosts, who later became detached ministers of divine vengeance. The Erinyes are the dark aspect of the benevolent Eumenides the angry ghosts. (Delphika.-(A) The Erinyes. (B) The Omphalos, by Jane E. Harrison. The Journal of Hellenic Studies, Vol. 19, pp. 205-251) It is also claimed that Eumenides is a euphemism for the Erinyes.

Email Regarding Cell Phone Use While Driving Assignment

Email Regarding Cell Phone Use While Driving - Assignment Example Nowadays, it is seen that many traffic accidents are there because of usage of cell phones while driving. We should not ignore this crucial disadvantage of cell phone usage while driving. In accordance to the laws made for cell phone usage in Texas as described by Governors Highway Safety Association (2009), the novice drivers who do not have a six months experience are forbidden to use cell phones for calling and text messaging while driving. In addition, the drivers who are travelling with passengers equal to seventeen or more than seventeen are also restricted not to use cell phones (Insurance Institute for Highway Safety, 2009). In the light of described laws, the drivers should use company provided cell phones but they should be experienced in driving. In addition, they are required to park their vehicles for using cell phones. They are not allowed to use cell phones while driving. There is no exception for drivers driving inside Texas and outside Texas. The sales representatives will adhere to the company policy of using cell phones that is to park their vehicle and then attend to any call or text message. By this way, neither the business nor the employees will be affected