CHAPTER 8 Introduction to Hypothesis Testing 8.1 Inferential Statistics and Hypothesis Testing LEARNING OBJECTIVES 8.2 Four Steps to Hypothesis Testing After reading this chapter‚ you should be able to: 8.3 Hypothesis Testing and Sampling Distributions 8.4 Making a Decision: Types of Error 8.5 Testing a Research Hypothesis: Examples Using the z Test 8.6 Research in Focus: Directional Versus Nondirectional Tests 8.7 Measuring the Size
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Hypothesis Testing: Alzheimer ’s Disease Natalie Sullivan PSY/315 August 8‚ 2011 Deborah Suzzane Ph.D. Hypothesis Testing: Alzheimer ’s Disease One in eight American’s over age 65 are diagnosed with Alzheimer’s disease. This number continues to grow as the population increases. The number of people affected by Alzheimer’s is alarming. The Alzheimer’s Association (2011) estimates that 5.4 million Americans of all ages suffer from this disease. Team A will attempt to form a hypothesis stating
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What causes Anorexia Nervosa? Eating disorders are not new. Anorexia Nervosa was first formally diagnosed in 1874‚ and the symptoms have been observed as far back as 300 years ago.(Walsh and Devlin 1) Although the condition has been known for centuries‚ it seems to be center stage now during the last decade or so. What is behind Anorexia? Is it inherited? Is Anorexia caused by some type of mental illness‚ or maybe environmental pressures? Does culture play a role in whether or not someone suffers
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section of the article). 6 pts Example of a directional hypothesis: Dogs will spend more time in physical contact with their sick owners than will cats. The first hypothesis was homophobic men are more sexually aroused to homosexual signs then non-homophobic men. The second hypothesis was homophobic men are more hostile or aggressive than non-homophobic men. 2) Did the results of the study support or refute the researchers’ first hypothesis/prediction? Explain how you came to this conclusion.
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A hypothesis is a claim Population mean The mean monthly cell phone bill in this city is μ = $42 Population proportion Example: The proportion of adults in this city with cell phones is π = 0.68 States the claim or assertion to be tested Is always about a population parameter‚ not about a sample statistic Is the opposite of the null hypothesis e.g.‚ The average diameter of a manufactured bolt is not equal to 30mm ( H1: μ ≠ 30 ) Challenges the status quo Alternative never contains
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as a vast societal problem as well. Like obesity‚ eating disorders like anorexia can be an example of sociological imagination too. Anorexia is a disease that can be analyzed on the personal level while it is under an individual’s control whether or not to eating food. However‚ it can also be examined on a public level because it affects a lot of people in our society and the causes stem from our culture’s behaviors. Anorexia is an emotional disorder characterized by a fixated desire to lose weight
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Cause and Effect of Anorexia Of all girls and women in the United States‚ ten percent will be affected by an eating disorder. Men and women alike are affected‚ however it is more common in women‚ specifically those aged thirteen to twenty. The most common eating disorder among teenage girls is anorexia nervosa. This disease is mostly linked with an overwhelming desire to be thin. People take extreme measures to achieve this goal (“Causes”). Anorexia is a very mysterious and misunderstood disease
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Anorexia in Teenage Girls Adolescence is the most crucial stage of development in which one is mostly influenced by what is seen in society‚ culture‚ and fashion. These influences can lead to eating disorders such as anorexia nervosa. Anorexia Nervosa is a psychological disorder characterized by a fear of weight gain‚ body image issues and maintenance of low body weight (American Psychiatric Association‚1994). On average‚ teenage girls under the ages of twelve to seventeen years old suffer from anorexia
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The biological explanation for Anorexia Nervosa focuses on the role of neurotransmitters. It suggests disturbances in the levels of serotonin and dopamines are characteristic of anorexia. Bailer et al compared serotonin activity in women recovering from restricting anorexia with those recovering from purging type anorexia with a healthy control group. They found that the group recovering from purging type anorexia had higher serotonin activity. They also found the highest levels of serotonin in women
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Anorexia Nervosa Anorexia is a mental disorder found in the “Diagnostic and Statistical Manual for Mental Disorders” book. Anorexia Nervosa starts as weight loss and fear of weight gain in which the individual stops eating due to many different influences. The DSM edition 5 describes the criteria of Anorexia Nervosa as being 3 essential features. The first is “persistent energy intake restriction.” (American Psychiatric Association‚ 2013) This includes weight being below a minimally normal level
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