A researcher has participants exprcting to receive either painful or mild electrical shocksduring a study wait in a quarter-full waiting room with other participants. He then measureswhether they choose to sit next to other participants or if they sit far away on their own.What is the best test to run for this study and why?PreviousNext »

In survival analysis studies both parametric and non-parametric statistics are used. For example, in…

Answered: A researcher has participants expacting…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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You are a medical researcher that wants to determine if your new drug can lower people's blood pressure. You recruit 60 participants with high blood pressure to be part of your study. You randomly assign participants to one of three groups to receive either 10 mg of your drug, 5 mg, or 0 mg (given as a placebo control). After 2 weeks, participants' blood pressure is measured and you compare among the 3 groups. Which statistical test would be best to determine if there is a significant difference in blood pressure among the three groups?
In testing a certain kind of truck tire over rugged terrain, it is found that 39% of the trucks fail to complete the test run without a blowout. Of the next 15 trucks tested, find the probability that at least 3 trucks have blowouts.
A researcher wants to examine the effect of daily mental exercises on cognitive performance of people in early stages of Alzheimer's disease. She enrolled to her study n = 16 patients diagnosed with the early stage of Alzheimer's disease and all participants conducted daily mental exercises for a month. At the end of the program all enrolled patients took the MMSE test (i.e., Mini-Mental State Examination). The results show that the sample mean on the MMSE test was M = 23.6 with the standard deviation, s = 7. It is known that the MMSE mean in the population of patients with early Alzheimer's disease is µ = 20. Do these data show a significant effect of daily mental exercises on cognitive performance in early stages of Alzheimer's disease?
Does reading the Harry Potter books encourage tolerance? It depends. Italian fifth graders were (randomly) split into two groups. Half the students met with researchers and discussed passages from the Harry Potter books that handled prejudice, while the others talked about unrelated sections. *Data are fabricated but match actual results When determining whether or not the main effects and interactions were significant, for the sake of this assignment, let’s say that the difference between the calculated means/differences must be .7 or higher to be significant. Posttest attitudes toward immigration (7-pt scale) Discussed prejudice-related sections Discussed unrelated sections High identification w/ Harry 6.2 5.0 Low identification w/ Harry 4.2 4.4 Is there a main effect of identification? (calculate marginal means). Is there a main effect of section? (calculate marginal means). Is there an interaction effect? (calculate “difference of differences”)…
Fríða wants to explore the average number of restaurants tourists at a hostel visit during their stay. Her theory is that well dressed tourists (at her opinion) visit more restaurants than those worse dressed. She conducts an experiment where she picks 100 guests at random, asks them how many restaurants they have visited and after that she records how well they are dressed (on a scale from one to ten). What is the main statistical problem with Fríðas experiment? Please explain 1. There is no correction for placebo effects. 2. Experimenters bias can occur. 3. Sampling bias can occur. 4. The number of participants will be small and statistical tests will therefore have a small power. 5. R-command: There arrive at average 4 guests at the Blue Lagoon at each minute on a typical Wednesday in May. What is the probability of exactly four guests arriving the next minute? 1. 19.5 % 2. 50 % 3. 62.9 % 4. 25 %
A study is testing the effectiveness of a new allergy medication. Sixty people who reported they have allergies volunteered to be part of the study and were randomly assigned to one of two groups, as shown in the design web. 30 Receive Medication Randomly Assigned Compare Level of Allerg Symptoms after Severa Weeks 60 Subjects 30 Receive Placebo Which of the following accurately describes the benefit of comparison in the experiment shown in the design web? The level of allergic symptoms in both groups can be compared to see if the new medication had a significant effect. The overall level of allergic symptoms can be used to determine if the new allergy medication had a significant effect. The level of allergic symptoms in the group who received the medication can be used to determine if the medication had a significant effect. The level of allergic symptoms in both groups cannot be compared to determine if the medication had a significant effect because one group only received a…
A matched-subjects study and an independent-measures study both produced a t statistic with df = 10. How many individuals participated in each study? Can you explain this answer? I have asked twice and have gotten two wrong answers kindly help. Thank you!
You are part of a trivia team and have tracked your team's performance since you started playing, so you know that your scores are normally distributed with u = 76 and o = 12. Recently, a new person joined the team, and you think the scores have gotten better. The sample data is n = 12, sample mean = 86 Assuming a one tailed test, What is the test statistic?
What is the difference from a controlled variable and the control in a scientific experiment?
Professor Chase from the University of Kansas has been working on a new cholesterol medication that is being called CholestoCleaner. The university is now conducting studies to determine if there is a possible side effect of sore joints. Placebo (Population Rate) To help determine the usual rate of sore joints, the research team gave a placebo (sugar pill) to 2017 subjects. Of those 2017 subjects, 4 of them developed sore joints. CholestoCleaner Trial The CholestoCleaner drug was given to 2622 subjects. Of those 2622 subjects, 19 of them developed sore joints. Preliminary Math If we consider the general population of people that don't use CholestoCleaner, what is the probability that they will develop sore joints? (Enter your answer as a fraction.) If you had a sample size of 2622 that did NOT use CholestoCleaner, how many would expect to develop sore joints? When 2622 subjects DID use the drug, there were 19 subjects that developed sore joints. Does it seem as though sore joints…
The best way to ensure that your sample represents the population it came from accurately, is to make sure you have a sample of at least 10. (n=10) True or false

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