Imagine you work for a psychological testing agenccy and you have been assigned the role of analyzing the data. The experiment involves testing 4 different drugs in treating 20 asthma patients. They were each asked to take the 4 different drugs in 4 different weeks and record how many attacks they had while taking each drug per week.   Explain one challenge you may experience with this experiment?

You have collected BMI data on a group of 30 college-age females. You are curious to find out how your sample’s average BMI compares to the national average. After a quick Google search, you discover that the national average BMI for college-age females is 22. Which t-test do you run to see if your sample is significantly different from the national average?

You have been hired by a local middle school to teach students about drugs and the harms of drug use. Being the statistician that you are, you want to see how effective your lecture is at increasing knowledge; therefore, you give them a pretest of 10 questions to measure their knowledge of drugs and the harms of drug use. After your lecture, you give the same students a posttest and measure their knowledge of drugs and the harms of drug use. BY HAND, Determine whether the students’ knowledge significantly increased as a result of your lecture. Use an alpha of .05. Pre                Post 3 6 1 4 0 5 4 3 2 9 5 9 3 3 2 7 3 6 4 8

A study is conducted to determine the effect of walnuts on concentration. Subjects were given 1 tablespoon of walnuts and asked to perform a memory test. Scores for the test were recorded in Excel. What is tool in this scenario?

Viveiros investigated the influence of video game playing on arousal. She had participants rate their arousal on a seven point scale (1 = very low arousal and 7 = very high arousal). Participants rated their arousal at the beginning of the study and then after one hour of video game play. What test is appropriate?

A new cream was developed to reduce the irritation caused by poison ivy. To test the effectiveness, researchers placed an ad online asking for volunteers to participate in the study. One hundred subjects replied and were informed that one group would receive the new cream and the other group would Which of the following accurately describes the benefit of comparison in the experiment? O The overall level of irritation can be compared to see if the new cream had a significant effect. O The level of irritation for both groups can be receive a cream with no active ingredient. All 100 subjects were exposed to poison ivy. Fifty were then randomly assigned to the group with the new cream, and 50 were randomly assigned to the group with the cream with no active ingredient. After three days, the subjects' level of irritation was measured. compared to see if the new cream had a significant effect. O The level of irritation in the treatment group only can be compared to see if the new cream had…

You are a professor interested in studying the relationship between social media and mental health. You immerse yourself in the literature and read dozens of research articles. After reading the articles it was evident the field claims adolescents with more than 100 social media interactions (post, likes, comments, reactions) will have anxiety. You want to test this claim and decided to carry out a research study. Before you go out to recruit adolescents at a middle school you need to choose an instrument to use in your study that assess anxiety levels. You found two instruments after searching the internet. One instrument, called Form A, cost money to use it and is the gold standard in assessing anxiety levels in adolescent. The other instrument is a free instrument developed by a professor called Form B. You don't want to spend a lot of money buying Form A. If Form A positively correlated with Form B you can justify using Form B in your study. You get a random sample of 10…

The principal of Paul Revere High School bragged that his 2016 graduating class of 1500 students achieved impressive scores on their ACT exams. He announced that an “astounding” 36% of the class got a score of 29 or higher, 54% got a score of 21 to 28, and only 10% less than 21. You want to test whether these ACT results are really that astounding. You visit the ACT website to see that the national results are 34% getting a score over 28, 58% getting 21 to 28, and 8% less than 21. Test whether or not the principal is correct to brag that his proportions were more impressive than the national performance. Use an alpha of 0.05.   So I kinda understand the question. I am mostly confused about how to determine the degree of freedom to get the critical value. Like I know the formula is d-C, and C is the number of categories in the word problem, but is there 3? Or am I just totally wrong?

In Class Exercise You are asked to evaluate the effect of a fast acting blood pressure medication. You take a random sample of 200 people from the population and assign half of them at random to take the pill. Of the 100 you told to take the pil| 25 refuse and 75 take it. At the end of a week you check the blood pressure of the group assigned to get the pill and it is 120 on average and the blood pressure of the group assigned to control is 127.5 on average. 1. What is Y;, what is Z;, what is D;? 2. What is the first stage? Estimate and interpret 3. What is the reduced form? Estimate and interpret. 4. What is the effect of the drug on blood pressure?

We want to know if students with bronchitis at 5 years have more cough symptoms when they grow up. Out of 290 children with Bronchitis at Age 5, 32 of them has cough symptoms at Age 12. Out of 970 children with no Bronchitis at Age 5, 43 of them has cough symptoms at Age 12. Is the cough symptom equally prevalent in both populations?