Research has shown that losing even one night of sleep can have a significant effect on performance ofcomplex tasks such as problem solving (Linde & Bergstroem, 1992). To demonstrate this phenomenon, aresearcher conducted the following (simulated) experiment: A sample of n = 18 college students wasgiven a problem-solving task at noon on one day and again at noon on the following day. The students werenot permitted any sleep between the two tests. For each student, the difference between the first andsecond score was recorded. For this sample, the students averaged Mp = 4.7 points better on the firsttest with a standard deviation of SDa = 8.3 for the difference scores.Conduct an analysis with this data using a = 0.02. (Put in 1 - alpha for the C-Level in your calculator.)Give the 98% confidence interval for the average difference score:< Hd <

We have to find confidence interval for differences. Formula : CI = Md ±tα/2, n-1×SDdn Where , Md is…

Answered: Research has shown that losing even one…

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 special education teacher did research on whether or not there is a relationship between the number of students in his class and the number incidents of “acting out” behaviors exhibited by the autistic students in the classroom. He collects data for a year and aggregates them by month. He obtained the statistics below, r= -.863 R2=.74 b= -1.212294 a= 131.176598 10.) How does the presence of more students affect the incidents in the class? a) as students are added the incidences increase b) as students are added the incidences decrease c) the number of students does not affect acting out d) the number of students caused more incidents How much of the variability of acting out is explained by the number of students in the class?___________
Exercise is known to produce positive psychological effects. Interestingly, not all exercise is equally effective. It turns out that exercising in a natural environment (e.g., jogging in the woods) produces better psychological outcomes than exercising in urban environments or in homes (Mackay & Neill, 2010). Suppose that a sports psychologist is interested in testing whether there is a difference between exercise in nature and exercise in the lab with respect to post-exercise anxiety levels. The researcher recruits n 5 7 participants who exercise in the lab and exercise on a nature trail. The data below represent the anxiety scores that were measured after each exercise session. Treat the data as if the scores are from an independent-measures study using two separate samples, each with n 5 7 participants. Compute the pooled variance, the estimated standard error for the mean difference, and the independent-measures t statistic. Using a 5 .05, is there a significant difference…
Strack, Martin, and Stepper (1988) reported that people rate cartoons as funnier when holding a pen in their teeth (which forced them to smile) than when holding a pen in their lips (which forced them to frown). A researcher attempted to replicate this result using a sample of n = 25 adults between the ages 40 and 45. For each person, the researcher recorded the difference between the rating obtained while smiling and the rating obtained by frowning. On average, the cartoons were rated funnier when the participants were smiling, with an average difference of M D = 1.6 with SS = 150. In this problem, you do not have to calculate SS or the mean difference which is already provided. Do the data indicate that the cartoons are rated significantly funnier when the participants are smiling? Use a one-tailed test with α = .05 Please answer the question using all of the steps: null in word, alternative in words, null in symbols, alternative in symbols, critical region t, df, all steps in…
A researcher has access to 100 participants for an independent sample design study, and she is hoping to achieve power = .80.What effect size will her data need to achieve to make that possible?
Dr. Mackintosh believes a new olfactory therapy would be more successful in promoting weight loss among obese patients. His patients are first weighed and then randomly assigned to olfactory therapy, dance therapy, or a control condition. At the end of the three weeks, the amount of weight lost is recorded. The results indicate no significant difference in the amount of weight lost between the three conditions. If true differences existed between the conditions, but they were not detected, what kind of error occurred?
The following questions relate to this SPSS output: An experimenter wanted to test the effect of music on cognitive performance. She created two equivalent groups and asked each person to perform a proofreading task on a short research paper. Participants in group 1 performed the task with no music playing in the background, participants in group 2 performed the task with a selection of hard rock playing in the
Annie conducts a study to examine the differences in stress levels between pet owners and non-pet owners. She conducts a two-tailed test and tells that she rejected the null hypothesis. Therefore, which of these statements is true? Question 8 options: Pet owners have more stress than non-pet owners. Pet owners have less stress than non-pet owners. Pet owners' and non-pet owners' stress levels differ, but it is not known how they differ. Pet owners' and non-pet owners' stress levels do not differ.
Strack, Martin, and Stepper (1988) reported that people rate cartoons as funnier when holding a pen in their teeth (which forced them to smile) than when holding a pen in their lips (which forced them to frown). A researcher attempted to replicate this result using a sample of n = 25 adults between the ages 40 and 45. For each person, the researcher recorded the difference between the rating obtained while smiling and the rating obtained by frowning. On average, the cartoons were rated funnier when the participants were smiling, with an average difference of M D = 1.6 with SS = 150. In this problem, you do not have to calculate SS or the mean difference which is already provided. Will there be a difference between the two conditions? Use a two-tailed test with α= .01 Show all the steps. n = df = MD= μD = s2 = SM D= State the hypothesis s and select alpha (consider one tailed or two tailed): Locate critical region for stated alpha: Compute test statistic (Repeated measure t-score):…
Does the test result Provide sufficient evidence that light alcohol consumption has a negative impact on the driving performance of a sleep deprived driver. Why or why not
Roediger and Karpicke (2006) investigated whether the test-enhanced learning effect (the demonstration that repeated testing improves memory for material) was due merely to repeated exposure to material. They randomly assigned participants to one of two conditions(study-study or study-test) and to one of three interval conditions (final test at a delay of 5 minutes, 2 days, or 1 week). The dependent variable was the proportion of idea units recalled for an encyclopedia. How should this be labeled? a. 4x2 between-groups ANOVA b. 2x2 within-groups ANOVA c. 2x3 within-groups ANOVA d. 2x3 between-groups ANOVA

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