3) A researcher wants to determine if exposure to subliminal (unconscious) images depicting older adults (80-95years old) will influence the time it takes pedestrians to get across a busy intersection using a crosswalk. Arandom sample of sixty pedestrians are exposed to a set of subliminally presented positive images using aspecial electronic traffic signal before the signal prompts them to cross. From previous studies (using the samecrosswalk and intersection), the experimenter knows that when no subliminal images are presented, the averagetime it takes the city's population to cross is 30.5 seconds, with a standard deviation = 5.5 seconds. ΣDn(E D²) – (E D)*t =n - 1n= number of pairs of scores (for example, if 8 people are measured at tl and t2, df = 8-1 = 7)D= the difference between each pair of scoresED = the sum of the differences(ED²) = the sum of the squares of the differences(ED)²= the sum of the differences squaredt score: Independent Samples t-test (degrees of freedom = (n1 – 1) + (n2 – 1))え-るt =n, -1n, -1X1= mean of first group (sample)X2= mean of second group (sample)s1 = sample variance of first groups?, = sample variance of second groupn1 = number of subjects (or observations) in the first groupn, = number of subjects in second groupBe careful about computing the denominator; pay attention to whether you are working with sample variances or standarddeviations to make sure your computations are correct.One Way ANOVA (see ANOVA table for degrees of freedom)Between Groups Sum of Squares: Subtract the grand mean from each group mean, square the deviation,multiply by n in each group and add the values together.. Σn(Χ, - X.SSB =n = the number of subjects or observations in a groupX. = the mean for any group (1 through n) of subjectsXg = the overall, or grand, mean for all subjects or observationsWithin Groups Sum of Squares: Subtract each group's mean from the individual scores and add them all up.SSw ΣΣ (X - XX = any single score within any particular groupX,= the mean of any particular groupnG = number of groupsN= total # of subjects/observationsSdfMSFTreatmentdf =F =MS =SS, / dfp(Between= B)MS, /MSwng-1dfw =N - nGError (Within= W) SSwMSw =SSw/ dfwSSrotalSSg + SSwTotaldfr.Total =N -1 =df,+ dfw

Given information: A researcher wants to determine if exposure to subliminal (unconscious) images…

Answered: 3) A researcher wants to determine if…

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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A warehouse manager wants to know if there is an association between the shift worked and being on time for work. To investigate, he selects a random sample of 70 workers and classifies each one according to the shift they worked most recently and whether they were on time for work. He was unable to classify a substantial number of people as being on time, so he classified those individuals as unknown. The data are displayed in the table. The manager would like to know if these data provide convincing evidence of an association between the shift worked and being on time in the large population of all workers at this warehouse. The random and 10% conditions are met. Is the Large Counts condition met? Yes, the smallest expected count is 5, so all expected counts are at least 5. Yes, the smallest expected count is 8.54, so all expected counts are at least 5. No, the smallest expected count is 2.56, so the expected counts are not all at least 5. No, the smallest expected count is…
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A doctor is studying the relationship between blood pressure and heartbeat abnormalities in her patients. She tests a random sample of her patients and notes their blood pressures (high, low, or normal) and their heartbeats (regular or irregular). She finds that: 14% have high blood pressure. • 22% have low blood pressure. 15% have an irregular heartbeat. • Of those with an irregular heartbeat, one-third have high blood pressure. • Of those with normal blood pressure, one-eighth have an irregular heartbeat. What portion of the patients selected have a regular heartbeat and low blood pressure? (0.2)
Recent research findings have shown that older people who practice ballroom dancing are 77% less likely to experience dementia compared to those senior citizens who did not dance. Drawing on this surprising result, Dr. Anders Ericsson thinks that ballroom dancing may also reduce one's level of stress to a greater extent than conventional exercise routines. To validate his claim Dr. Ericsson has randomly selected 100 senior citizens who were then randomly split into two groups, with the first group practicing ballroom dancing 3 times a week and the second group undergoing a conventional exercise regiment 3 times a week also. The measures of stress were assessed for each participant after the study was completed. What is the most appropriate set of hypotheses for this study? HO: μD- 0; H1: μD 0 HO: µD = 0; H1: µD > 0 %3D HO: udance - pexercise = 0; H1: µdance - pexercise <0
Researchers have noted a decline in cognitive functioning as people age (Bartus, 1990). However, the results from other research suggest that the antioxidants in foods such as blueberries may reduce and even reverse these age-related declines (Joseph et al., 1999). To examine this phenomenon, suppose that a researcher obtains a sample of n = 16 adults who are between the ages of 65 and 75. The researcher uses a standardized test to measure cognitive performance for each individual. The participants then begin a 2-month program in which they receive daily doses of a blueberry supplement. At the end of the 2-month period, the researcher again measures cognitive performance for each participant. The results show an average increase in performance of MD = 7.4 with SS = 1215. Does this result support the conclusion that the antioxidant supplement has a significant effect on cognitive performance? Use a two-tailed test with α = .05. Show your computations.
The Wall Street Journal asked Concur Technologies, Inc., an expense management company, to examine data from 8.3 million expense reports to provide insights regarding business travel expenses. Their analysis of the data showed that New York was the most expensive city. The following table shows the average daily hotel room rate (X) and the average amount spent on entertainment (Y) for a random sample of 9 of the 25 most-visited U.S. cities. These data lead to the estimated regression equation y = 17.49 + 1.0334x. For these data SSE = 1541.4. Use Table 1 of Appendix B. a. Predict the amount spent on entertainment for a particular city that has a daily room rate of $89 (to 2 decimals). b. Develop a 95% confidence interval for the mean amount spent on entertainment for all cities that have a daily room rate of $89 (to 2 decimals). c. The average room rate in Chicago is $128. Develop a 95% prediction interval for the amount spent on entertainment in Chicago (to 2 decimals).
A 2017 random study of 10,478 Bangladesh children tracked the washing habits of the children's mothers via random survey to understand the relationship of these habits with childhood wasting. The data provided include responses from mothers to two items in this survey. The first variable represents a household's access to food: food secure, mildly food insecure, moderately food insecure, or severely food insecure. The second variable represents the mothers' responses when asked whether they use soap when washing clothes. These researchers wish to study if there is a relationship between washing habits and food security. Are the conditions for a chi-square test of independence met? Did not use Used soap soap Food secure 921 Mildly food insecure 5591 81 200 Moderately 89 food insecure 203 Severely 825 Food insecure 2568 Not enough information No Yes

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