Say Dr. Callahan measures her students' levels of narcissism. Her findings reveal thatnarcissism rates are higher in her male students versus her female students, a finding thatis consistent with previous research. She also finds that the overall class average (11.5 outof 20) is lower than typical undergraduates' levels (15.5). Which of the followingstatements about this scenario is TRUE?She can conclude that being a SSU student is associated with lower levels ofnarcissism.She needs to be skeptical of her findings because she did not have a random sample.She needs to be skeptical of her findings because she did not have randomassignment.She can conclude that her sample is externally valid because it replicates previousresearch.She can conclude that being a SSU student causes narcissism to decrease.

Given information: Her findings reveal that narcissism rates are higher in her male students versus…

Answered: Say Dr. Callahan measures her students'…

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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What is the summary of the overall model of the data shown in question 1? Is it one that you would trust from a statistical standpoint? specifically why ?
It appears that there is some truth to the old adage “That which doesn’t kill us makes us stronger.” Seery, Holman, and Silver (2010) found that indi- viduals with some history of adversity report better mental health and higher well-being compared to people with little or no history of adversity. In an attempt to examine this phenomenon, a researcher surveys a group of college students to determine the negative life events that they experienced in the past 5 years and their current feeling of well-being. For n = 18 participants with 2 or fewer negative experi- ences, the average well-being score is M = 42 with SS = 398, and for n = 16 participants with5 to 10 negative experiences the average score is M = 48.6 with SS = 370.a. Is there a significant difference between the two populations represented by these two samples? Use a two-tailed test with α = .05
The personality characteristics of business leaders (e.g., CEOs) are related to the operations of the businesses that they lead (Oreg & Berson, 2018). Traits like openness to experience are related to positive financial outcomes and other traits are related to negative financial outcomes for their businesses. Suppose that a board of directors is interested in evaluating the personality of their leadership. Among a sample of n = 16 managers, the sample mean of the openness to experiences dimension of personality was M = 4.50. Assuming that μ = 4.24 and σ = 1.05 (Cobb-Clark & Schurer, 2012), use a two-tailed hypothesis test with α = .05 to test the hypothesis that this company’s business leaders’ openness to experience is different from the population.
A researcher conducts an independent-measures study to examine how the brain chemical serotonin is related to aggression. One sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin. A second sample of rats, low serotonin group, receives a drug that lowers brain levels of serotonin. Then, the researcher tests the animals by recording the number of aggressive responses each of the rats display. See the data below. Is there a significant difference between the control group and the low serotonin group regarding the number of aggressive responses? Control Low Serotonin n = 10 n = 15 M = 14 M = 19 SS = 180.5 SS = 130 Perform a hypothesis test using independent-measures t-test. Use a two-tailed…
Does the shape or color of a pain pill influence its effectiveness? Although logically it shouldn’t, whether we believe a drug will work does have a powerful effect on our perceptions (e.g., placebo effect). In this experiment, 4 groups of adult patients were given the same amount of Advil after dental surgery for pain relief, but the color and shape of the pill varied. Researchers hypothesized that an unusual shape or color would lead people to believe the pills were new and special and thus would expect them to be more effective than common round, white pills. Researchers also wanted to know if there is an interaction between shape and color what is the purpose and design of the study as well as the characteristics of the participants in the sample?
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