Give me the answer with a grading of E, or Excellent AP Statistics -Unit 3 Investigative Task

A recent study of residents in a busy city showed that prolonged exposure to traffic noise (defined as continuous exposure to sound levels above 70 decibels) caused an increase in stress levels. The National Urban Health Association wanted to see if this connection holds true for rural residents. To answer their question, an experiment is to be conducted with 75 female rural homeowners who have varying levels of noise exposure in their daily lives. The subjects will be assigned to the following levels of simulated noise exposure: 0, 2, 4, and 8 hours per day. Simulated noise includes recorded traffic sounds, construction noise, airplane flyovers, and other urban sounds played through speakers in controlled environments. Before each subject participates in the experiment, researchers plan to survey each to establish a baseline stress index, using a statistically valid stress measurement tool with a scale of 1 to 100 (1 being completely calm, 100 being extremely stressed). After participating in the noise exposure treatment, subjects will complete the survey a second time for a new measurement of their stress index.

Component 1 (Identification)- clearly identify the following. The subjects involved in the experiment. The factor of interest The specific treatments - be sure to give each treatment a label (such as Treatment A, Treatment B or Treatment 1, Treatment 2) which you will use throughout the task. The response variable and how it will be measured. A variable that will be controlled and a benefit of controlling this variable. Component 2 (Survey) - The survey that was given to each subject to establish the baseline stress level will consist of several questions but the researchers are torn on what the first question should be. Here are three options for the first survey question. a) How many times per week do you typically lose your cool in front of others because you are stressed? b) Research has shown that when people outwardly demonstrate their stress to others it can lead to damaged relationships. How many times per week do you typically lose your cool in front of others because you are stressed? c) Within the temporal framework of a standard seven-day period, how frequently do you exhibit behavioral dysregulation characterized by a significant deviation from baseline emotional equilibrium, commonly referred to as a loss of composure, in response to environmental or interpersonal stimuli? Comment on each question, discussing whether it is an appropriate survey question and clearly explain why. For any questions that are not appropriate, discuss how it may lead to biased results. If there would be a clear direction to any bias, identify that direction. Justify your answers. Component 3 (Completely Randomized Experiment) - you have decided to use a completely randomized design for this experiment with the 75 female participants. Draw a diagram to outline your experiment. Clearly and concisely describe your randomization process to assign treatments to your participants. Describe a confounding variable that may affect your results and explain what you could do in a future experiment to control this confounding variable.

Component 4 (Randomized Block Experiment)- One of your colleagues points out that the 75 homeowners have very different incomes. You decide to block the experiment based on income with the following yearly incomes as blocks - below $25,000 (12 people), $25,000 to $74,999 (44 people), $75,000 to $500,000 (15 people), and above $500,000 (4 people). Why would you incorporate a block design in this case? Draw a diagram to outline your experiment. Be sure to include how you will implement randomization. Briefly explain the benefits of this design over the completely randomized design. Unit 3 Investigative Task Rubric

Each component will be scored individually as either E (Essentially Correct), P (Partially Correct), or I (Incorrect) Component 1 E - Clearly identifies the subjects involved, the factor, the specific treatments (with clear identifiers), the response variable with corresponding measurement procedure, and a variable that is controlled with a plausible benefit P - No more than 2 errors in the identification of the above I - 3 or more errors in the identification of the above Component 2 E - Correctly determines whether each of the 3 questions are appropriate survey questions with reasonable explanations for each. For each inappropriate survey question, correctly describes how it could lead to biased results. If there is a clear direction to the bias, this direction is clearly described P - Correctly determines whether each of the 3 questions are appropriate survey questions but one of the following two errors are present: Explanations may be unclear or require additional clarification OR For each inappropriate survey question, bias is vaguely described or clear direction of bias is not given I - Errors made in determining whether the 3 questions are appropriate. Explanations are missing or incorrect. Component 3 E - Correctly diagrams the experiment. Clearly describes a randomization procedure to assign treatments to participants. Reader does not need any clarification. A logical confounding variable is described and makes a connection between the confounding variable and the response variable. Concisely describes action to be taken to control the confounding variable. P - Correctly diagrams the experiment, but randomization procedure is incorrect or unclear. Reader needs minor clarification. OR Errors in the diagram of the experiment. Clearly describes a randomization procedure to assign treatments to participants. Reader needs minor clarification. Confounding variable is not logical or fails to make a connection between the confounding variable and the response variable. An attempt at controlling the confounding variable is made, but it is confusing, wordy, or incorrect. I - Errors in diagram of the experiment. Randomization procedure is incorrect or unclear. Reader needs major clarification. Component 4 E - Correctly diagrams experiment with randomization procedure. Clearly explains why a block design is appropriate and a statistically valid benefit to a block design. Answer is concise. P - Only a minor error in the diagram of experiment or the randomization procedure. Explains why a block design is appropriate and provides a benefit to a block design though it is not applicable to this experiment.

I - Several minor errors in the diagram of experiment or a major error. Reasoning for appropriateness of a block design is not correct. Benefit to a block design is not applicable to this experiment.