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Unformatted text preview: Homework 4 You have just begun a new job! Unfortunately, within two weeks, you come to the conclusion that your boss is a bit abusive, as he/she constantly yells at you. You begin experiencing more trouble sleeping, and are nervous all the time. Being a responsible scientist, you know that your sample size (yourself) is not adequate for assessing whether or not the effects that you are experiencing are characteristic of what tends to happen with loud bosses. As such, you decide to run a study to assess whether loud bosses lead to greater stress. You go into your workplace and hook five of your randomly selected co workers up to machines to measure their stress level via breathing rates. When they interact with their boss, you record the decibels of their boss’ screaming, and then measure the breathing rate of your friend. The data are as follows (make sure to show work!): Participant ID Boss’s Screaming Decibels Breaths per 5 minutes 1
2
3
4
5 65
95
80
78
69 81
97
86
91
89 Question 1: a. What is the theory? b. What is the hypothesis? (hint: your theory is abstract, your hypothesis is concrete) c. What kind of study are you running (hint: go back to lecture 2)? d. Based on the type of study you are running, which of the following variables are you using: predictor, independent, dependent, criterion? Identify which variables you are using and which concept/measurement corresponds to which type of variable. e. Identify whether your variables are discrete or continuous. Question 2: a. Identify the population. b. Identify the sample. c. Identify the sampling strategy. d. What level of measurement is used to capture decibels and breathing rate? Question 3: a. Calculate the measure of central tendency you think would best represent the breathing rate data. b. Calculate the standard deviation of the breathing rate data. c. Calculate the z score for each of the breathing rate scores using your sample mean and standard deviation as your population mean and standard deviation. d. What would the z score be for someone who had a breathing rate of 100? Interpret this score. Question 4: a. Hand draw a scatterplot of the observed data b. Using excel, create a scatterplot of the observed data c. What can you tell from the scatterplot? Question 5: a. You next want to calculate the correlation to better understand what your data are telling you. What assumptions are you making in calculating the correlation? b. Calculate by hand the value of the Pearson r using the computational formula and use excel to check your work (make sure to copy and paste your excel columns and calculations). Question 6: a. At this point, can you determine whether your hypothesis is supported? Why or why not? What can you conclude? b. What concerns might you have about this study? c. If someone wanted to persuade people that this theory were correct, regardless of truth, discuss three tactics they could use. ...
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 Spring '08
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