explain thepartici-22. A researcher investigated the effect ofof randomly selected students and obtained the following means and sums ofpants' accuracy rates while performing a difficult task. He tested three groupssquares:XnLow Volume Moderate Volume61.54SourceBetween groupsWithin groupsTotal65.55Sum of Squares652.16612.751264.92High Volumedf48.257Mean SquareFa) Complete the ANOVA. (b) At a = .05, what is Ferit? (c) Report the statisticalesults in the proper format. (d) Perform the appropriate post hoc tests. (e) Whatyou conclude about this study? (f) Compute the effect size and interpret it.

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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A researcher investigated the effect of different volumes of background noise on participants’ accuracy rates while performing a difficult task. He tested three groups (n = 11) and obtained thefollowing means: for low volume, X̅ = 66.5; for medium, X̅ = 61.5; for loud, X̅ = 48.25. He computed the following sums of squares: Source Sum of Squares df Mean Square F Between 452.16 Within 522.75 Total 974.91 Complete the ANOVA summary table. What are H0 and Ha? What is Fcrit? What do you conclude about Fobt? Perform the Tukey HSD test if appropriate. What do you conclude about this relationship? What is the effect size in this study, and what does this tell you about this factor?
In a science fair project, Emily conducted an experiment in which she tested professional touch Ktherapists to see if they could sense her energy field. She flipped a coin to select either her right hand or her left hand, and then she asked the therapists to identify the selected hand by placing their hand just under Emily's hand without seeing it and without touching it. Among 357 trials, the touch therapists were correct 169 times. Complete parts (a) through (d). S View an example Get more help. 4- & 87 U 0.5 (Type an integer or a decimal. Do not round.) b. Using Emily's sample results, what is the best point estimate of the therapists' success rate? 0.473 (Round to three decimal places as needed.) c. Using Emily's sample results, construct a 90% confidence interval estimate of the proportion of correct responses made by touch therapists. F
Psychologists at Disney World measured factors that affect the scariness of the soundtrack for their Haunted House ride. In particular, they were interested in the loudness of the screams (soft versus loud) and the length of the screams (short versus long). They used a 2 × 2 factorial design to test how these factors combined. They collected data from 10 different riders in each of the four conditions. Each rider rated the scariness of the ride on a nine-point scale. short screams long screams soft screams T=38, n = 10, SS = 13.6 T=64, n = 10, SS = 22.4 loud screams T=52, n=10, SS = 29.6 T=50, n=10, SS = 16.0 For these data: G = 204, N = 40, X2 = 1156. 1. Sketch a dataplot of the mean rating in each condition. 2. Calculate SS total, the total sum of squares 3. Calculate SSwithin, the within-treatments sum of squares. 4. Calculate SSbetween, the between-treatments sum of squares. 5. Calculate SSA the sum of squares for Factor A (length of scream). 6. Calculate SSB, the sum of squares…
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A researcher investi of randomly selected students and obtained the following means and sums of pants' accuracy rates while performing a difficult task. He tested three groups squares: Low Volume Moderate Volume High Volume 48 25