Concept explainers
Head movement evaluations are important because disabled individuals may be able to operate communications aids using head motion. The paper “Constancy of Head Turning Recorded in Healthy Young Humans” (Journal of Biomedical Engineering [2008]: 428–436) reported the accompanying data on neck rotation (in degrees) for 14 subjects both in the clockwise direction (CL) and in the counterclockwise direction (CO). For purposes of this exercise, you can assume that the 14 subjects are representative of the population of adult Americans. Based on these data, is it reasonable to conclude that
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Chapter 11 Solutions
Introduction To Statistics And Data Analysis
- Researchers were interested in assessing whether stress levels at the beginning of the semester are related to (i.e., correlated with) stress levels during finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week. Participant Stress 1 Stress 2 (X - MX) (Y - MY) (X - MX) (Y - MY) (X - MX)2 (Y - MY)2 1 22 22 -4.4 -6 2 32 34 5.6 6 3 24 25 -2.4 -3 4 28 30 1.6 2 5 26 29 -0.4 1 What is the observed correlation coefficient (i.e., r value)?arrow_forwarddoes this relationship apears to be positive, negative, or zero correlation?arrow_forwardAnalyze your data from Exercise 2 (coin toss using 2 coins). Copy your results from there and write under the Observed column. Is my answer correct?arrow_forward
- us. What does this suggest? Source: Pegna, Alan J. et al., "Discriminating Emotional Faces without Primary Visual Cortices Involves the Right Amygdala." Nature Neuroscience, 8(1), 2005. 28. Reproducibility Researchers looked at studies that were reported in newspapers with the goal of determining whether initial studies had results that could be reproduced. Reproducibility of results means that subsequent analysis confirms the conclusion of the original study. Primary studies are studies where the researchers come up with a research objective, clearly state the goals of the study and population, describe the research method, test the research hypotheses, and draw conclusions. (a) Among the 156 primary studies reported by newspapers, 76 had results that were validated by subsequent analysis. Does this suggest less than a majority of initial studies reported by newspapers have their results validated by subsequent analysis? (b) In the article, a null effect is defined as any study where…arrow_forward(33) Christian Daniel - Ahora X Quiz: Chapter 09: Chapter Quiz X A kccd.instructure.com/courses/43... 图☆ FX Question 9 1 pts On a standardized spatial skills task, normative data reveal that people typically get u = 15 correct solutions. A psychologist test n = 7 individuals who have brain injuries in the right cerebral hemisphere. For the following data, determine whether or not right- hemisphere damage results in significantly reduced performance on the spatial skills task. Test with alpha = .05 and a one-tailed %3D distribution. The data are as follows: 12, 16, 9, 8, 10, 17, 10 What is the t value for this study? tsample = 4.882 O tsample = 2.87 Isample = - 2.49 O tsample = 0.424 Question 10 1 ptsarrow_forwardA data set from a study that examined the effect of a specific diet on blood pressure is provided . Participants (n = 72) were randomly assigned either to a group that was put on the diet (Diet = Present) or to a group that was not put on the diet (Diet = Absent), and researchers wanted to know whether the diet had a significant impact on blood pressure. Fully interpret the results in the context of this study (i.e., report the conclusions as related to the research question).arrow_forward
- A study was conducted to assess the potential of using color for body orienting. 85 college students, reclining on their backs in the dark, found it difficult to establish orientation when positioned on under a rotating disk. This rotating disk was painted half black and half white. Out of the 85 students, 71 believed they were right side up when the white was on top. Use this information to estimate the true proportion of subjects who use the white color as a cue for right-side-up orientation. That is, construct a 98% confidence interval for the true proportion.arrow_forwardWhich of the independent variables retains the strongest association with the number of children a respondent has when all other variables in the model are controlled?arrow_forwardMakers of generic drugs are required to show that their generic drugs do not differ significantly from the “reference” or brand name drugs that they imitate. One aspect in which the generic drugs might differ is their extent of absorption in the blood. Twelve subjects were available for the study. Six were randomly selected to receive the generic drug first and then, after a washout period, receive the “reference” drug. The remaining six received the “reference” drug first, followed by the generic drug after the washout period. Suppose the t test statistic is t = 1.72. What is the p-value for a two-sided test? Group of answer choices 0.05 < p-value < 0.10 0.40 < p-value < 0.50 0.20 < p-value < 0.25 0.10 < p-value < 0.20arrow_forward
- A study is conducted to determine the relationship between study hours and exam scores, what is the dependent variable in this scenario?arrow_forwardAn educator is interested in determining if the medium used for online classes, whether a smartphone or laptop/desktop, influences the time (hrs) that Grade 12 students spend in these classes. A random sample of 10 students who were using smartphones and another random sample of 10 students who were using laptop/desktop were interviewed and reported the following times they spend in their daily online classes: Smartphone 0 30230 1 5 4 3 Medium for Online Class Laptop/Desktop 2 7 3 3 0 3 1 3 15 Suppose the assumption of equality of variance is satisfied. Perform an appropriate test of hypothesis to determine if the average time spent online significantly differs between the students using these two mediums. Use a 5% level of significance.arrow_forwardMakers of generic drugs are required to show that their generic drugs do not differ significantly from the “reference” or brand name drugs that they imitate. One aspect in which the generic drugs might differ is their extent of absorption in the blood. Twelve subjects were available for the study. Six were randomly selected to receive the generic drug first and then, after a washout period, receive the “reference” drug. The remaining six received the “reference” drug first, followed by the generic drug after the washout period. Assume that all conditions are met. The mean of the differences was 1.33 and the standard deviation of those differences was 2.90. What is the test statistic for this procedure? Group of answer choices 2.35 1.59 1.90 5.50arrow_forward
- Calculus For The Life SciencesCalculusISBN:9780321964038Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.Publisher:Pearson Addison Wesley,Big Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt